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
  25#include "qemu/osdep.h"
  26#include "qapi/error.h"
  27#include "qemu/cutils.h"
  28#include "block/block_int.h"
  29#include "qemu/module.h"
  30#include "qemu/option.h"
  31#include "block/raw-aio.h"
  32#include "trace.h"
  33#include "block/thread-pool.h"
  34#include "qemu/iov.h"
  35#include "qapi/qmp/qdict.h"
  36#include "qapi/qmp/qstring.h"
  37#include <windows.h>
  38#include <winioctl.h>
  39
  40#define FTYPE_FILE 0
  41#define FTYPE_CD     1
  42#define FTYPE_HARDDISK 2
  43
  44typedef struct RawWin32AIOData {
  45    BlockDriverState *bs;
  46    HANDLE hfile;
  47    struct iovec *aio_iov;
  48    int aio_niov;
  49    size_t aio_nbytes;
  50    off64_t aio_offset;
  51    int aio_type;
  52} RawWin32AIOData;
  53
  54typedef struct BDRVRawState {
  55    HANDLE hfile;
  56    int type;
  57    char drive_path[16]; /* format: "d:\" */
  58    QEMUWin32AIOState *aio;
  59} BDRVRawState;
  60
  61/*
  62 * Read/writes the data to/from a given linear buffer.
  63 *
  64 * Returns the number of bytes handles or -errno in case of an error. Short
  65 * reads are only returned if the end of the file is reached.
  66 */
  67static size_t handle_aiocb_rw(RawWin32AIOData *aiocb)
  68{
  69    size_t offset = 0;
  70    int i;
  71
  72    for (i = 0; i < aiocb->aio_niov; i++) {
  73        OVERLAPPED ov;
  74        DWORD ret, ret_count, len;
  75
  76        memset(&ov, 0, sizeof(ov));
  77        ov.Offset = (aiocb->aio_offset + offset);
  78        ov.OffsetHigh = (aiocb->aio_offset + offset) >> 32;
  79        len = aiocb->aio_iov[i].iov_len;
  80        if (aiocb->aio_type & QEMU_AIO_WRITE) {
  81            ret = WriteFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
  82                            len, &ret_count, &ov);
  83        } else {
  84            ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
  85                           len, &ret_count, &ov);
  86        }
  87        if (!ret) {
  88            ret_count = 0;
  89        }
  90        if (ret_count != len) {
  91            offset += ret_count;
  92            break;
  93        }
  94        offset += len;
  95    }
  96
  97    return offset;
  98}
  99
 100static int aio_worker(void *arg)
 101{
 102    RawWin32AIOData *aiocb = arg;
 103    ssize_t ret = 0;
 104    size_t count;
 105
 106    switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
 107    case QEMU_AIO_READ:
 108        count = handle_aiocb_rw(aiocb);
 109        if (count < aiocb->aio_nbytes) {
 110            /* A short read means that we have reached EOF. Pad the buffer
 111             * with zeros for bytes after EOF. */
 112            iov_memset(aiocb->aio_iov, aiocb->aio_niov, count,
 113                      0, aiocb->aio_nbytes - count);
 114
 115            count = aiocb->aio_nbytes;
 116        }
 117        if (count == aiocb->aio_nbytes) {
 118            ret = 0;
 119        } else {
 120            ret = -EINVAL;
 121        }
 122        break;
 123    case QEMU_AIO_WRITE:
 124        count = handle_aiocb_rw(aiocb);
 125        if (count == aiocb->aio_nbytes) {
 126            ret = 0;
 127        } else {
 128            ret = -EINVAL;
 129        }
 130        break;
 131    case QEMU_AIO_FLUSH:
 132        if (!FlushFileBuffers(aiocb->hfile)) {
 133            return -EIO;
 134        }
 135        break;
 136    default:
 137        fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
 138        ret = -EINVAL;
 139        break;
 140    }
 141
 142    g_free(aiocb);
 143    return ret;
 144}
 145
 146static BlockAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
 147        int64_t offset, QEMUIOVector *qiov, int count,
 148        BlockCompletionFunc *cb, void *opaque, int type)
 149{
 150    RawWin32AIOData *acb = g_new(RawWin32AIOData, 1);
 151    ThreadPool *pool;
 152
 153    acb->bs = bs;
 154    acb->hfile = hfile;
 155    acb->aio_type = type;
 156
 157    if (qiov) {
 158        acb->aio_iov = qiov->iov;
 159        acb->aio_niov = qiov->niov;
 160        assert(qiov->size == count);
 161    }
 162    acb->aio_nbytes = count;
 163    acb->aio_offset = offset;
 164
 165    trace_file_paio_submit(acb, opaque, offset, count, type);
 166    pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
 167    return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
 168}
 169
 170int qemu_ftruncate64(int fd, int64_t length)
 171{
 172    LARGE_INTEGER li;
 173    DWORD dw;
 174    LONG high;
 175    HANDLE h;
 176    BOOL res;
 177
 178    if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
 179        return -1;
 180
 181    h = (HANDLE)_get_osfhandle(fd);
 182
 183    /* get current position, ftruncate do not change position */
 184    li.HighPart = 0;
 185    li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
 186    if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 187        return -1;
 188    }
 189
 190    high = length >> 32;
 191    dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
 192    if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 193        return -1;
 194    }
 195    res = SetEndOfFile(h);
 196
 197    /* back to old position */
 198    SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
 199    return res ? 0 : -1;
 200}
 201
 202static int set_sparse(int fd)
 203{
 204    DWORD returned;
 205    return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
 206                                 NULL, 0, NULL, 0, &returned, NULL);
 207}
 208
 209static void raw_detach_aio_context(BlockDriverState *bs)
 210{
 211    BDRVRawState *s = bs->opaque;
 212
 213    if (s->aio) {
 214        win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
 215    }
 216}
 217
 218static void raw_attach_aio_context(BlockDriverState *bs,
 219                                   AioContext *new_context)
 220{
 221    BDRVRawState *s = bs->opaque;
 222
 223    if (s->aio) {
 224        win32_aio_attach_aio_context(s->aio, new_context);
 225    }
 226}
 227
 228static void raw_probe_alignment(BlockDriverState *bs, Error **errp)
 229{
 230    BDRVRawState *s = bs->opaque;
 231    DWORD sectorsPerCluster, freeClusters, totalClusters, count;
 232    DISK_GEOMETRY_EX dg;
 233    BOOL status;
 234
 235    if (s->type == FTYPE_CD) {
 236        bs->bl.request_alignment = 2048;
 237        return;
 238    }
 239    if (s->type == FTYPE_HARDDISK) {
 240        status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 241                                 NULL, 0, &dg, sizeof(dg), &count, NULL);
 242        if (status != 0) {
 243            bs->bl.request_alignment = dg.Geometry.BytesPerSector;
 244            return;
 245        }
 246        /* try GetDiskFreeSpace too */
 247    }
 248
 249    if (s->drive_path[0]) {
 250        GetDiskFreeSpace(s->drive_path, &sectorsPerCluster,
 251                         &dg.Geometry.BytesPerSector,
 252                         &freeClusters, &totalClusters);
 253        bs->bl.request_alignment = dg.Geometry.BytesPerSector;
 254        return;
 255    }
 256
 257    /* XXX Does Windows support AIO on less than 512-byte alignment? */
 258    bs->bl.request_alignment = 512;
 259}
 260
 261static void raw_parse_flags(int flags, bool use_aio, int *access_flags,
 262                            DWORD *overlapped)
 263{
 264    assert(access_flags != NULL);
 265    assert(overlapped != NULL);
 266
 267    if (flags & BDRV_O_RDWR) {
 268        *access_flags = GENERIC_READ | GENERIC_WRITE;
 269    } else {
 270        *access_flags = GENERIC_READ;
 271    }
 272
 273    *overlapped = FILE_ATTRIBUTE_NORMAL;
 274    if (use_aio) {
 275        *overlapped |= FILE_FLAG_OVERLAPPED;
 276    }
 277    if (flags & BDRV_O_NOCACHE) {
 278        *overlapped |= FILE_FLAG_NO_BUFFERING;
 279    }
 280}
 281
 282static void raw_parse_filename(const char *filename, QDict *options,
 283                               Error **errp)
 284{
 285    bdrv_parse_filename_strip_prefix(filename, "file:", options);
 286}
 287
 288static QemuOptsList raw_runtime_opts = {
 289    .name = "raw",
 290    .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
 291    .desc = {
 292        {
 293            .name = "filename",
 294            .type = QEMU_OPT_STRING,
 295            .help = "File name of the image",
 296        },
 297        {
 298            .name = "aio",
 299            .type = QEMU_OPT_STRING,
 300            .help = "host AIO implementation (threads, native)",
 301        },
 302        { /* end of list */ }
 303    },
 304};
 305
 306static bool get_aio_option(QemuOpts *opts, int flags, Error **errp)
 307{
 308    BlockdevAioOptions aio, aio_default;
 309
 310    aio_default = (flags & BDRV_O_NATIVE_AIO) ? BLOCKDEV_AIO_OPTIONS_NATIVE
 311                                              : BLOCKDEV_AIO_OPTIONS_THREADS;
 312    aio = qapi_enum_parse(&BlockdevAioOptions_lookup, qemu_opt_get(opts, "aio"),
 313                          aio_default, errp);
 314
 315    switch (aio) {
 316    case BLOCKDEV_AIO_OPTIONS_NATIVE:
 317        return true;
 318    case BLOCKDEV_AIO_OPTIONS_THREADS:
 319        return false;
 320    default:
 321        error_setg(errp, "Invalid AIO option");
 322    }
 323    return false;
 324}
 325
 326static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 327                    Error **errp)
 328{
 329    BDRVRawState *s = bs->opaque;
 330    int access_flags;
 331    DWORD overlapped;
 332    QemuOpts *opts;
 333    Error *local_err = NULL;
 334    const char *filename;
 335    bool use_aio;
 336    int ret;
 337
 338    s->type = FTYPE_FILE;
 339
 340    opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
 341    qemu_opts_absorb_qdict(opts, options, &local_err);
 342    if (local_err) {
 343        error_propagate(errp, local_err);
 344        ret = -EINVAL;
 345        goto fail;
 346    }
 347
 348    if (qdict_get_try_bool(options, "locking", false)) {
 349        error_setg(errp, "locking=on is not supported on Windows");
 350        ret = -EINVAL;
 351        goto fail;
 352    }
 353
 354    filename = qemu_opt_get(opts, "filename");
 355
 356    use_aio = get_aio_option(opts, flags, &local_err);
 357    if (local_err) {
 358        error_propagate(errp, local_err);
 359        ret = -EINVAL;
 360        goto fail;
 361    }
 362
 363    raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
 364
 365    if (filename[0] && filename[1] == ':') {
 366        snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", filename[0]);
 367    } else if (filename[0] == '\\' && filename[1] == '\\') {
 368        s->drive_path[0] = 0;
 369    } else {
 370        /* Relative path.  */
 371        char buf[MAX_PATH];
 372        GetCurrentDirectory(MAX_PATH, buf);
 373        snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", buf[0]);
 374    }
 375
 376    s->hfile = CreateFile(filename, access_flags,
 377                          FILE_SHARE_READ, NULL,
 378                          OPEN_EXISTING, overlapped, NULL);
 379    if (s->hfile == INVALID_HANDLE_VALUE) {
 380        int err = GetLastError();
 381
 382        error_setg_win32(errp, err, "Could not open '%s'", filename);
 383        if (err == ERROR_ACCESS_DENIED) {
 384            ret = -EACCES;
 385        } else {
 386            ret = -EINVAL;
 387        }
 388        goto fail;
 389    }
 390
 391    if (use_aio) {
 392        s->aio = win32_aio_init();
 393        if (s->aio == NULL) {
 394            CloseHandle(s->hfile);
 395            error_setg(errp, "Could not initialize AIO");
 396            ret = -EINVAL;
 397            goto fail;
 398        }
 399
 400        ret = win32_aio_attach(s->aio, s->hfile);
 401        if (ret < 0) {
 402            win32_aio_cleanup(s->aio);
 403            CloseHandle(s->hfile);
 404            error_setg_errno(errp, -ret, "Could not enable AIO");
 405            goto fail;
 406        }
 407
 408        win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs));
 409    }
 410
 411    ret = 0;
 412fail:
 413    qemu_opts_del(opts);
 414    return ret;
 415}
 416
 417static BlockAIOCB *raw_aio_preadv(BlockDriverState *bs,
 418                                  uint64_t offset, uint64_t bytes,
 419                                  QEMUIOVector *qiov, int flags,
 420                                  BlockCompletionFunc *cb, void *opaque)
 421{
 422    BDRVRawState *s = bs->opaque;
 423    if (s->aio) {
 424        return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
 425                                cb, opaque, QEMU_AIO_READ);
 426    } else {
 427        return paio_submit(bs, s->hfile, offset, qiov, bytes,
 428                           cb, opaque, QEMU_AIO_READ);
 429    }
 430}
 431
 432static BlockAIOCB *raw_aio_pwritev(BlockDriverState *bs,
 433                                   uint64_t offset, uint64_t bytes,
 434                                   QEMUIOVector *qiov, int flags,
 435                                   BlockCompletionFunc *cb, void *opaque)
 436{
 437    BDRVRawState *s = bs->opaque;
 438    if (s->aio) {
 439        return win32_aio_submit(bs, s->aio, s->hfile, offset, bytes, qiov,
 440                                cb, opaque, QEMU_AIO_WRITE);
 441    } else {
 442        return paio_submit(bs, s->hfile, offset, qiov, bytes,
 443                           cb, opaque, QEMU_AIO_WRITE);
 444    }
 445}
 446
 447static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
 448                         BlockCompletionFunc *cb, void *opaque)
 449{
 450    BDRVRawState *s = bs->opaque;
 451    return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
 452}
 453
 454static void raw_close(BlockDriverState *bs)
 455{
 456    BDRVRawState *s = bs->opaque;
 457
 458    if (s->aio) {
 459        win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
 460        win32_aio_cleanup(s->aio);
 461        s->aio = NULL;
 462    }
 463
 464    CloseHandle(s->hfile);
 465    if (bs->open_flags & BDRV_O_TEMPORARY) {
 466        unlink(bs->filename);
 467    }
 468}
 469
 470static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
 471                                        bool exact, PreallocMode prealloc,
 472                                        Error **errp)
 473{
 474    BDRVRawState *s = bs->opaque;
 475    LONG low, high;
 476    DWORD dwPtrLow;
 477
 478    if (prealloc != PREALLOC_MODE_OFF) {
 479        error_setg(errp, "Unsupported preallocation mode '%s'",
 480                   PreallocMode_str(prealloc));
 481        return -ENOTSUP;
 482    }
 483
 484    low = offset;
 485    high = offset >> 32;
 486
 487    /*
 488     * An error has occurred if the return value is INVALID_SET_FILE_POINTER
 489     * and GetLastError doesn't return NO_ERROR.
 490     */
 491    dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
 492    if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 493        error_setg_win32(errp, GetLastError(), "SetFilePointer error");
 494        return -EIO;
 495    }
 496    if (SetEndOfFile(s->hfile) == 0) {
 497        error_setg_win32(errp, GetLastError(), "SetEndOfFile error");
 498        return -EIO;
 499    }
 500    return 0;
 501}
 502
 503static int64_t raw_getlength(BlockDriverState *bs)
 504{
 505    BDRVRawState *s = bs->opaque;
 506    LARGE_INTEGER l;
 507    ULARGE_INTEGER available, total, total_free;
 508    DISK_GEOMETRY_EX dg;
 509    DWORD count;
 510    BOOL status;
 511
 512    switch(s->type) {
 513    case FTYPE_FILE:
 514        l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
 515        if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 516            return -EIO;
 517        break;
 518    case FTYPE_CD:
 519        if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
 520            return -EIO;
 521        l.QuadPart = total.QuadPart;
 522        break;
 523    case FTYPE_HARDDISK:
 524        status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 525                                 NULL, 0, &dg, sizeof(dg), &count, NULL);
 526        if (status != 0) {
 527            l = dg.DiskSize;
 528        }
 529        break;
 530    default:
 531        return -EIO;
 532    }
 533    return l.QuadPart;
 534}
 535
 536static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
 537{
 538    typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
 539                                              DWORD * high);
 540    get_compressed_t get_compressed;
 541    struct _stati64 st;
 542    const char *filename = bs->filename;
 543    /* WinNT support GetCompressedFileSize to determine allocate size */
 544    get_compressed =
 545        (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
 546                                            "GetCompressedFileSizeA");
 547    if (get_compressed) {
 548        DWORD high, low;
 549        low = get_compressed(filename, &high);
 550        if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
 551            return (((int64_t) high) << 32) + low;
 552        }
 553    }
 554
 555    if (_stati64(filename, &st) < 0) {
 556        return -1;
 557    }
 558    return st.st_size;
 559}
 560
 561static int raw_co_create(BlockdevCreateOptions *options, Error **errp)
 562{
 563    BlockdevCreateOptionsFile *file_opts;
 564    int fd;
 565
 566    assert(options->driver == BLOCKDEV_DRIVER_FILE);
 567    file_opts = &options->u.file;
 568
 569    if (file_opts->has_preallocation) {
 570        error_setg(errp, "Preallocation is not supported on Windows");
 571        return -EINVAL;
 572    }
 573    if (file_opts->has_nocow) {
 574        error_setg(errp, "nocow is not supported on Windows");
 575        return -EINVAL;
 576    }
 577
 578    fd = qemu_open(file_opts->filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 579                   0644);
 580    if (fd < 0) {
 581        error_setg_errno(errp, errno, "Could not create file");
 582        return -EIO;
 583    }
 584    set_sparse(fd);
 585    ftruncate(fd, file_opts->size);
 586    qemu_close(fd);
 587
 588    return 0;
 589}
 590
 591static int coroutine_fn raw_co_create_opts(BlockDriver *drv,
 592                                           const char *filename,
 593                                           QemuOpts *opts,
 594                                           Error **errp)
 595{
 596    BlockdevCreateOptions options;
 597    int64_t total_size = 0;
 598
 599    strstart(filename, "file:", &filename);
 600
 601    /* Read out options */
 602    total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
 603                          BDRV_SECTOR_SIZE);
 604
 605    options = (BlockdevCreateOptions) {
 606        .driver     = BLOCKDEV_DRIVER_FILE,
 607        .u.file     = {
 608            .filename           = (char *) filename,
 609            .size               = total_size,
 610            .has_preallocation  = false,
 611            .has_nocow          = false,
 612        },
 613    };
 614    return raw_co_create(&options, errp);
 615}
 616
 617static QemuOptsList raw_create_opts = {
 618    .name = "raw-create-opts",
 619    .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
 620    .desc = {
 621        {
 622            .name = BLOCK_OPT_SIZE,
 623            .type = QEMU_OPT_SIZE,
 624            .help = "Virtual disk size"
 625        },
 626        { /* end of list */ }
 627    }
 628};
 629
 630BlockDriver bdrv_file = {
 631    .format_name        = "file",
 632    .protocol_name      = "file",
 633    .instance_size      = sizeof(BDRVRawState),
 634    .bdrv_needs_filename = true,
 635    .bdrv_parse_filename = raw_parse_filename,
 636    .bdrv_file_open     = raw_open,
 637    .bdrv_refresh_limits = raw_probe_alignment,
 638    .bdrv_close         = raw_close,
 639    .bdrv_co_create_opts = raw_co_create_opts,
 640    .bdrv_has_zero_init = bdrv_has_zero_init_1,
 641    .bdrv_has_zero_init_truncate = bdrv_has_zero_init_1,
 642
 643    .bdrv_aio_preadv    = raw_aio_preadv,
 644    .bdrv_aio_pwritev   = raw_aio_pwritev,
 645    .bdrv_aio_flush     = raw_aio_flush,
 646
 647    .bdrv_co_truncate   = raw_co_truncate,
 648    .bdrv_getlength     = raw_getlength,
 649    .bdrv_get_allocated_file_size
 650                        = raw_get_allocated_file_size,
 651
 652    .create_opts        = &raw_create_opts,
 653};
 654
 655/***********************************************/
 656/* host device */
 657
 658static int find_cdrom(char *cdrom_name, int cdrom_name_size)
 659{
 660    char drives[256], *pdrv = drives;
 661    UINT type;
 662
 663    memset(drives, 0, sizeof(drives));
 664    GetLogicalDriveStrings(sizeof(drives), drives);
 665    while(pdrv[0] != '\0') {
 666        type = GetDriveType(pdrv);
 667        switch(type) {
 668        case DRIVE_CDROM:
 669            snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
 670            return 0;
 671            break;
 672        }
 673        pdrv += lstrlen(pdrv) + 1;
 674    }
 675    return -1;
 676}
 677
 678static int find_device_type(BlockDriverState *bs, const char *filename)
 679{
 680    BDRVRawState *s = bs->opaque;
 681    UINT type;
 682    const char *p;
 683
 684    if (strstart(filename, "\\\\.\\", &p) ||
 685        strstart(filename, "//./", &p)) {
 686        if (stristart(p, "PhysicalDrive", NULL))
 687            return FTYPE_HARDDISK;
 688        snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
 689        type = GetDriveType(s->drive_path);
 690        switch (type) {
 691        case DRIVE_REMOVABLE:
 692        case DRIVE_FIXED:
 693            return FTYPE_HARDDISK;
 694        case DRIVE_CDROM:
 695            return FTYPE_CD;
 696        default:
 697            return FTYPE_FILE;
 698        }
 699    } else {
 700        return FTYPE_FILE;
 701    }
 702}
 703
 704static int hdev_probe_device(const char *filename)
 705{
 706    if (strstart(filename, "/dev/cdrom", NULL))
 707        return 100;
 708    if (is_windows_drive(filename))
 709        return 100;
 710    return 0;
 711}
 712
 713static void hdev_parse_filename(const char *filename, QDict *options,
 714                                Error **errp)
 715{
 716    bdrv_parse_filename_strip_prefix(filename, "host_device:", options);
 717}
 718
 719static void hdev_refresh_limits(BlockDriverState *bs, Error **errp)
 720{
 721    /* XXX Does Windows support AIO on less than 512-byte alignment? */
 722    bs->bl.request_alignment = 512;
 723}
 724
 725static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
 726                     Error **errp)
 727{
 728    BDRVRawState *s = bs->opaque;
 729    int access_flags, create_flags;
 730    int ret = 0;
 731    DWORD overlapped;
 732    char device_name[64];
 733
 734    Error *local_err = NULL;
 735    const char *filename;
 736    bool use_aio;
 737
 738    QemuOpts *opts = qemu_opts_create(&raw_runtime_opts, NULL, 0,
 739                                      &error_abort);
 740    qemu_opts_absorb_qdict(opts, options, &local_err);
 741    if (local_err) {
 742        error_propagate(errp, local_err);
 743        ret = -EINVAL;
 744        goto done;
 745    }
 746
 747    filename = qemu_opt_get(opts, "filename");
 748
 749    use_aio = get_aio_option(opts, flags, &local_err);
 750    if (!local_err && use_aio) {
 751        error_setg(&local_err, "AIO is not supported on Windows host devices");
 752    }
 753    if (local_err) {
 754        error_propagate(errp, local_err);
 755        ret = -EINVAL;
 756        goto done;
 757    }
 758
 759    if (strstart(filename, "/dev/cdrom", NULL)) {
 760        if (find_cdrom(device_name, sizeof(device_name)) < 0) {
 761            error_setg(errp, "Could not open CD-ROM drive");
 762            ret = -ENOENT;
 763            goto done;
 764        }
 765        filename = device_name;
 766    } else {
 767        /* transform drive letters into device name */
 768        if (((filename[0] >= 'a' && filename[0] <= 'z') ||
 769             (filename[0] >= 'A' && filename[0] <= 'Z')) &&
 770            filename[1] == ':' && filename[2] == '\0') {
 771            snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
 772            filename = device_name;
 773        }
 774    }
 775    s->type = find_device_type(bs, filename);
 776
 777    raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
 778
 779    create_flags = OPEN_EXISTING;
 780
 781    s->hfile = CreateFile(filename, access_flags,
 782                          FILE_SHARE_READ, NULL,
 783                          create_flags, overlapped, NULL);
 784    if (s->hfile == INVALID_HANDLE_VALUE) {
 785        int err = GetLastError();
 786
 787        if (err == ERROR_ACCESS_DENIED) {
 788            ret = -EACCES;
 789        } else {
 790            ret = -EINVAL;
 791        }
 792        error_setg_errno(errp, -ret, "Could not open device");
 793        goto done;
 794    }
 795
 796done:
 797    qemu_opts_del(opts);
 798    return ret;
 799}
 800
 801static BlockDriver bdrv_host_device = {
 802    .format_name        = "host_device",
 803    .protocol_name      = "host_device",
 804    .instance_size      = sizeof(BDRVRawState),
 805    .bdrv_needs_filename = true,
 806    .bdrv_parse_filename = hdev_parse_filename,
 807    .bdrv_probe_device  = hdev_probe_device,
 808    .bdrv_file_open     = hdev_open,
 809    .bdrv_close         = raw_close,
 810    .bdrv_refresh_limits = hdev_refresh_limits,
 811
 812    .bdrv_aio_preadv    = raw_aio_preadv,
 813    .bdrv_aio_pwritev   = raw_aio_pwritev,
 814    .bdrv_aio_flush     = raw_aio_flush,
 815
 816    .bdrv_detach_aio_context = raw_detach_aio_context,
 817    .bdrv_attach_aio_context = raw_attach_aio_context,
 818
 819    .bdrv_getlength      = raw_getlength,
 820    .has_variable_length = true,
 821
 822    .bdrv_get_allocated_file_size
 823                        = raw_get_allocated_file_size,
 824};
 825
 826static void bdrv_file_init(void)
 827{
 828    bdrv_register(&bdrv_file);
 829    bdrv_register(&bdrv_host_device);
 830}
 831
 832block_init(bdrv_file_init);
 833