block-raw-win32.c - qemu - Git at Google

 /*
  * Block driver for RAW files (win32)
  *
  * Copyright (c) 2006 Fabrice Bellard
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 #include "qemu-common.h"
 #include "qemu-timer.h"
 #include "block_int.h"
 #include <assert.h>
 #include <winioctl.h>

 //#define WIN32_AIO

 #define FTYPE_FILE 0
 #define FTYPE_CD     1
 #define FTYPE_HARDDISK 2

 typedef struct BDRVRawState {
     HANDLE hfile;
     int type;
     char drive_path[16]; /* format: "d:\" */
 } BDRVRawState;

 typedef struct RawAIOCB {
     BlockDriverAIOCB common;
     HANDLE hEvent;
     OVERLAPPED ov;
     int count;
 } RawAIOCB;

 int qemu_ftruncate64(int fd, int64_t length)
 {
     LARGE_INTEGER li;
     LONG high;
     HANDLE h;
     BOOL res;

     if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
 	return -1;

     h = (HANDLE)_get_osfhandle(fd);

     /* get current position, ftruncate do not change position */
     li.HighPart = 0;
     li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
     if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 	return -1;

     high = length >> 32;
     if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
 	return -1;
     res = SetEndOfFile(h);

     /* back to old position */
     SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
     return res ? 0 : -1;
 }

 static int set_sparse(int fd)
 {
     DWORD returned;
     return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
 				 NULL, 0, NULL, 0, &returned, NULL);
 }

 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
 {
     BDRVRawState *s = bs->opaque;
     int access_flags, create_flags;
     DWORD overlapped;

     s->type = FTYPE_FILE;

     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
         access_flags = GENERIC_READ | GENERIC_WRITE;
     } else {
         access_flags = GENERIC_READ;
     }
     if (flags & BDRV_O_CREAT) {
         create_flags = CREATE_ALWAYS;
     } else {
         create_flags = OPEN_EXISTING;
     }
 #ifdef WIN32_AIO
     overlapped = FILE_FLAG_OVERLAPPED;
 #else
     overlapped = FILE_ATTRIBUTE_NORMAL;
 #endif
     if ((flags & BDRV_O_NOCACHE))
         overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH;
     else if (!(flags & BDRV_O_CACHE_WB))
         overlapped |= FILE_FLAG_WRITE_THROUGH;
     s->hfile = CreateFile(filename, access_flags,
                           FILE_SHARE_READ, NULL,
                           create_flags, overlapped, NULL);
     if (s->hfile == INVALID_HANDLE_VALUE) {
         int err = GetLastError();

         if (err == ERROR_ACCESS_DENIED)
             return -EACCES;
         return -1;
     }
     return 0;
 }

 static int raw_pread(BlockDriverState *bs, int64_t offset,
                      uint8_t *buf, int count)
 {
     BDRVRawState *s = bs->opaque;
     OVERLAPPED ov;
     DWORD ret_count;
     int ret;

     memset(&ov, 0, sizeof(ov));
     ov.Offset = offset;
     ov.OffsetHigh = offset >> 32;
     ret = ReadFile(s->hfile, buf, count, &ret_count, &ov);
     if (!ret) {
 #ifdef WIN32_AIO
         ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
         if (!ret)
             return -EIO;
         else
 #endif
             return ret_count;
     }
     return ret_count;
 }

 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
                       const uint8_t *buf, int count)
 {
     BDRVRawState *s = bs->opaque;
     OVERLAPPED ov;
     DWORD ret_count;
     int ret;

     memset(&ov, 0, sizeof(ov));
     ov.Offset = offset;
     ov.OffsetHigh = offset >> 32;
     ret = WriteFile(s->hfile, buf, count, &ret_count, &ov);
     if (!ret) {
 #ifdef WIN32_AIO
         ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
         if (!ret)
             return -EIO;
         else
 #endif
             return ret_count;
     }
     return ret_count;
 }

 #ifdef WIN32_AIO
 static void raw_aio_cb(void *opaque)
 {
     RawAIOCB *acb = opaque;
     BlockDriverState *bs = acb->common.bs;
     BDRVRawState *s = bs->opaque;
     DWORD ret_count;
     int ret;

     ret = GetOverlappedResult(s->hfile, &acb->ov, &ret_count, TRUE);
     if (!ret || ret_count != acb->count) {
         acb->common.cb(acb->common.opaque, -EIO);
     } else {
         acb->common.cb(acb->common.opaque, 0);
     }
 }

 static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
         int64_t sector_num, uint8_t *buf, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque)
 {
     RawAIOCB *acb;
     int64_t offset;

     acb = qemu_aio_get(bs, cb, opaque);
     if (acb->hEvent) {
         acb->hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
         if (!acb->hEvent) {
             qemu_aio_release(acb);
             return NULL;
         }
     }
     memset(&acb->ov, 0, sizeof(acb->ov));
     offset = sector_num * 512;
     acb->ov.Offset = offset;
     acb->ov.OffsetHigh = offset >> 32;
     acb->ov.hEvent = acb->hEvent;
     acb->count = nb_sectors * 512;
     qemu_add_wait_object(acb->ov.hEvent, raw_aio_cb, acb);
     return acb;
 }

 static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
         int64_t sector_num, uint8_t *buf, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque)
 {
     BDRVRawState *s = bs->opaque;
     RawAIOCB *acb;
     int ret;

     acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
     if (!acb)
         return NULL;
     ret = ReadFile(s->hfile, buf, acb->count, NULL, &acb->ov);
     if (!ret) {
         qemu_aio_release(acb);
         return NULL;
     }
     qemu_aio_release(acb);
     return (BlockDriverAIOCB *)acb;
 }

 static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
         int64_t sector_num, uint8_t *buf, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque)
 {
     BDRVRawState *s = bs->opaque;
     RawAIOCB *acb;
     int ret;

     acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
     if (!acb)
         return NULL;
     ret = WriteFile(s->hfile, buf, acb->count, NULL, &acb->ov);
     if (!ret) {
         qemu_aio_release(acb);
         return NULL;
     }
     qemu_aio_release(acb);
     return (BlockDriverAIOCB *)acb;
 }

 static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
 {
     RawAIOCB *acb = (RawAIOCB *)blockacb;
     BlockDriverState *bs = acb->common.bs;
     BDRVRawState *s = bs->opaque;

     qemu_del_wait_object(acb->ov.hEvent, raw_aio_cb, acb);
     /* XXX: if more than one async I/O it is not correct */
     CancelIo(s->hfile);
     qemu_aio_release(acb);
 }
 #endif /* #if WIN32_AIO */

 static void raw_flush(BlockDriverState *bs)
 {
     BDRVRawState *s = bs->opaque;
     FlushFileBuffers(s->hfile);
 }

 static void raw_close(BlockDriverState *bs)
 {
     BDRVRawState *s = bs->opaque;
     CloseHandle(s->hfile);
 }

 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 {
     BDRVRawState *s = bs->opaque;
     DWORD low, high;

     low = offset;
     high = offset >> 32;
     if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN))
 	return -EIO;
     if (!SetEndOfFile(s->hfile))
         return -EIO;
     return 0;
 }

 static int64_t raw_getlength(BlockDriverState *bs)
 {
     BDRVRawState *s = bs->opaque;
     LARGE_INTEGER l;
     ULARGE_INTEGER available, total, total_free;
     DISK_GEOMETRY_EX dg;
     DWORD count;
     BOOL status;

     switch(s->type) {
     case FTYPE_FILE:
         l.LowPart = GetFileSize(s->hfile, &l.HighPart);
         if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
             return -EIO;
         break;
     case FTYPE_CD:
         if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
             return -EIO;
         l.QuadPart = total.QuadPart;
         break;
     case FTYPE_HARDDISK:
         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
         if (status != 0) {
             l = dg.DiskSize;
         }
         break;
     default:
         return -EIO;
     }
     return l.QuadPart;
 }

 static int raw_create(const char *filename, int64_t total_size,
                       const char *backing_file, int flags)
 {
     int fd;

     if (flags || backing_file)
         return -ENOTSUP;

     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
               0644);
     if (fd < 0)
         return -EIO;
     set_sparse(fd);
     ftruncate(fd, total_size * 512);
     close(fd);
     return 0;
 }

 BlockDriver bdrv_raw = {
     "raw",
     sizeof(BDRVRawState),
     NULL, /* no probe for protocols */
     raw_open,
     NULL,
     NULL,
     raw_close,
     raw_create,
     raw_flush,

 #ifdef WIN32_AIO
     .bdrv_aio_read = raw_aio_read,
     .bdrv_aio_write = raw_aio_write,
     .bdrv_aio_cancel = raw_aio_cancel,
     .aiocb_size = sizeof(RawAIOCB);
 #endif
     .bdrv_pread = raw_pread,
     .bdrv_pwrite = raw_pwrite,
     .bdrv_truncate = raw_truncate,
     .bdrv_getlength = raw_getlength,
 };

 /***********************************************/
 /* host device */

 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
 {
     char drives[256], *pdrv = drives;
     UINT type;

     memset(drives, 0, sizeof(drives));
     GetLogicalDriveStrings(sizeof(drives), drives);
     while(pdrv[0] != '\0') {
         type = GetDriveType(pdrv);
         switch(type) {
         case DRIVE_CDROM:
             snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
             return 0;
             break;
         }
         pdrv += lstrlen(pdrv) + 1;
     }
     return -1;
 }

 static int find_device_type(BlockDriverState *bs, const char *filename)
 {
     BDRVRawState *s = bs->opaque;
     UINT type;
     const char *p;

     if (strstart(filename, "\\\\.\\", &p) ||
         strstart(filename, "//./", &p)) {
         if (stristart(p, "PhysicalDrive", NULL))
             return FTYPE_HARDDISK;
         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
         type = GetDriveType(s->drive_path);
         if (type == DRIVE_CDROM)
             return FTYPE_CD;
         else
             return FTYPE_FILE;
     } else {
         return FTYPE_FILE;
     }
 }

 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 {
     BDRVRawState *s = bs->opaque;
     int access_flags, create_flags;
     DWORD overlapped;
     char device_name[64];

     if (strstart(filename, "/dev/cdrom", NULL)) {
         if (find_cdrom(device_name, sizeof(device_name)) < 0)
             return -ENOENT;
         filename = device_name;
     } else {
         /* transform drive letters into device name */
         if (((filename[0] >= 'a' && filename[0] <= 'z') ||
              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
             filename[1] == ':' && filename[2] == '\0') {
             snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
             filename = device_name;
         }
     }
     s->type = find_device_type(bs, filename);

     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
         access_flags = GENERIC_READ | GENERIC_WRITE;
     } else {
         access_flags = GENERIC_READ;
     }
     create_flags = OPEN_EXISTING;

 #ifdef WIN32_AIO
     overlapped = FILE_FLAG_OVERLAPPED;
 #else
     overlapped = FILE_ATTRIBUTE_NORMAL;
 #endif
     if ((flags & BDRV_O_NOCACHE))
         overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH;
     else if (!(flags & BDRV_O_CACHE_WB))
         overlapped |= FILE_FLAG_WRITE_THROUGH;
     s->hfile = CreateFile(filename, access_flags,
                           FILE_SHARE_READ, NULL,
                           create_flags, overlapped, NULL);
     if (s->hfile == INVALID_HANDLE_VALUE) {
         int err = GetLastError();

         if (err == ERROR_ACCESS_DENIED)
             return -EACCES;
         return -1;
     }
     return 0;
 }

 #if 0
 /***********************************************/
 /* removable device additional commands */

 static int raw_is_inserted(BlockDriverState *bs)
 {
     return 1;
 }

 static int raw_media_changed(BlockDriverState *bs)
 {
     return -ENOTSUP;
 }

 static int raw_eject(BlockDriverState *bs, int eject_flag)
 {
     DWORD ret_count;

     if (s->type == FTYPE_FILE)
         return -ENOTSUP;
     if (eject_flag) {
         DeviceIoControl(s->hfile, IOCTL_STORAGE_EJECT_MEDIA,
                         NULL, 0, NULL, 0, &lpBytesReturned, NULL);
     } else {
         DeviceIoControl(s->hfile, IOCTL_STORAGE_LOAD_MEDIA,
                         NULL, 0, NULL, 0, &lpBytesReturned, NULL);
     }
 }

 static int raw_set_locked(BlockDriverState *bs, int locked)
 {
     return -ENOTSUP;
 }
 #endif

 BlockDriver bdrv_host_device = {
     "host_device",
     sizeof(BDRVRawState),
     NULL, /* no probe for protocols */
     hdev_open,
     NULL,
     NULL,
     raw_close,
     NULL,
     raw_flush,

 #ifdef WIN32_AIO
     .bdrv_aio_read = raw_aio_read,
     .bdrv_aio_write = raw_aio_write,
     .bdrv_aio_cancel = raw_aio_cancel,
     .aiocb_size = sizeof(RawAIOCB);
 #endif
     .bdrv_pread = raw_pread,
     .bdrv_pwrite = raw_pwrite,
     .bdrv_getlength = raw_getlength,
 };
	/*
	* Block driver for RAW files (win32)
	*
	* Copyright (c) 2006 Fabrice Bellard
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/
	#include "qemu-common.h"
	#include "qemu-timer.h"
	#include "block_int.h"
	#include <assert.h>
	#include <winioctl.h>

	//#define WIN32_AIO

	#define FTYPE_FILE 0
	#define FTYPE_CD 1
	#define FTYPE_HARDDISK 2

	typedef struct BDRVRawState {
	HANDLE hfile;
	int type;
	char drive_path[16]; /* format: "d:\" */
	} BDRVRawState;

	typedef struct RawAIOCB {
	BlockDriverAIOCB common;
	HANDLE hEvent;
	OVERLAPPED ov;
	int count;
	} RawAIOCB;

	int qemu_ftruncate64(int fd, int64_t length)
	{
	LARGE_INTEGER li;
	LONG high;
	HANDLE h;
	BOOL res;

	if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
	return -1;

	h = (HANDLE)_get_osfhandle(fd);

	/* get current position, ftruncate do not change position */
	li.HighPart = 0;
	li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
	if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
	return -1;

	high = length >> 32;
	if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
	return -1;
	res = SetEndOfFile(h);

	/* back to old position */
	SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
	return res ? 0 : -1;
	}

	static int set_sparse(int fd)
	{
	DWORD returned;
	return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
	NULL, 0, NULL, 0, &returned, NULL);
	}

	static int raw_open(BlockDriverState bs, const char filename, int flags)
	{
	BDRVRawState *s = bs->opaque;
	int access_flags, create_flags;
	DWORD overlapped;

	s->type = FTYPE_FILE;

	if ((flags & BDRV_O_ACCESS) == O_RDWR) {
	access_flags = GENERIC_READ \| GENERIC_WRITE;
	} else {
	access_flags = GENERIC_READ;
	}
	if (flags & BDRV_O_CREAT) {
	create_flags = CREATE_ALWAYS;
	} else {
	create_flags = OPEN_EXISTING;
	}
	#ifdef WIN32_AIO
	overlapped = FILE_FLAG_OVERLAPPED;
	#else
	overlapped = FILE_ATTRIBUTE_NORMAL;
	#endif
	if ((flags & BDRV_O_NOCACHE))
	overlapped \|= FILE_FLAG_NO_BUFFERING \| FILE_FLAG_WRITE_THROUGH;
	else if (!(flags & BDRV_O_CACHE_WB))
	overlapped \|= FILE_FLAG_WRITE_THROUGH;
	s->hfile = CreateFile(filename, access_flags,
	FILE_SHARE_READ, NULL,
	create_flags, overlapped, NULL);
	if (s->hfile == INVALID_HANDLE_VALUE) {
	int err = GetLastError();

	if (err == ERROR_ACCESS_DENIED)
	return -EACCES;
	return -1;
	}
	return 0;
	}

	static int raw_pread(BlockDriverState *bs, int64_t offset,
	uint8_t *buf, int count)
	{
	BDRVRawState *s = bs->opaque;
	OVERLAPPED ov;
	DWORD ret_count;
	int ret;

	memset(&ov, 0, sizeof(ov));
	ov.Offset = offset;
	ov.OffsetHigh = offset >> 32;
	ret = ReadFile(s->hfile, buf, count, &ret_count, &ov);
	if (!ret) {
	#ifdef WIN32_AIO
	ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
	if (!ret)
	return -EIO;
	else
	#endif
	return ret_count;
	}
	return ret_count;
	}

	static int raw_pwrite(BlockDriverState *bs, int64_t offset,
	const uint8_t *buf, int count)
	{
	BDRVRawState *s = bs->opaque;
	OVERLAPPED ov;
	DWORD ret_count;
	int ret;

	memset(&ov, 0, sizeof(ov));
	ov.Offset = offset;
	ov.OffsetHigh = offset >> 32;
	ret = WriteFile(s->hfile, buf, count, &ret_count, &ov);
	if (!ret) {
	#ifdef WIN32_AIO
	ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
	if (!ret)
	return -EIO;
	else
	#endif
	return ret_count;
	}
	return ret_count;
	}

	#ifdef WIN32_AIO
	static void raw_aio_cb(void *opaque)
	{
	RawAIOCB *acb = opaque;
	BlockDriverState *bs = acb->common.bs;
	BDRVRawState *s = bs->opaque;
	DWORD ret_count;
	int ret;

	ret = GetOverlappedResult(s->hfile, &acb->ov, &ret_count, TRUE);
	if (!ret \|\| ret_count != acb->count) {
	acb->common.cb(acb->common.opaque, -EIO);
	} else {
	acb->common.cb(acb->common.opaque, 0);
	}
	}

	static RawAIOCB raw_aio_setup(BlockDriverState bs,
	int64_t sector_num, uint8_t *buf, int nb_sectors,
	BlockDriverCompletionFunc cb, void opaque)
	{
	RawAIOCB *acb;
	int64_t offset;

	acb = qemu_aio_get(bs, cb, opaque);
	if (acb->hEvent) {
	acb->hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
	if (!acb->hEvent) {
	qemu_aio_release(acb);
	return NULL;
	}
	}
	memset(&acb->ov, 0, sizeof(acb->ov));
	offset = sector_num * 512;
	acb->ov.Offset = offset;
	acb->ov.OffsetHigh = offset >> 32;
	acb->ov.hEvent = acb->hEvent;
	acb->count = nb_sectors * 512;
	qemu_add_wait_object(acb->ov.hEvent, raw_aio_cb, acb);
	return acb;
	}

	static BlockDriverAIOCB raw_aio_read(BlockDriverState bs,
	int64_t sector_num, uint8_t *buf, int nb_sectors,
	BlockDriverCompletionFunc cb, void opaque)
	{
	BDRVRawState *s = bs->opaque;
	RawAIOCB *acb;
	int ret;

	acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
	if (!acb)
	return NULL;
	ret = ReadFile(s->hfile, buf, acb->count, NULL, &acb->ov);
	if (!ret) {
	qemu_aio_release(acb);
	return NULL;
	}
	qemu_aio_release(acb);
	return (BlockDriverAIOCB *)acb;
	}

	static BlockDriverAIOCB raw_aio_write(BlockDriverState bs,
	int64_t sector_num, uint8_t *buf, int nb_sectors,
	BlockDriverCompletionFunc cb, void opaque)
	{
	BDRVRawState *s = bs->opaque;
	RawAIOCB *acb;
	int ret;

	acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
	if (!acb)
	return NULL;
	ret = WriteFile(s->hfile, buf, acb->count, NULL, &acb->ov);
	if (!ret) {
	qemu_aio_release(acb);
	return NULL;
	}
	qemu_aio_release(acb);
	return (BlockDriverAIOCB *)acb;
	}

	static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
	{
	RawAIOCB acb = (RawAIOCB )blockacb;
	BlockDriverState *bs = acb->common.bs;
	BDRVRawState *s = bs->opaque;

	qemu_del_wait_object(acb->ov.hEvent, raw_aio_cb, acb);
	/* XXX: if more than one async I/O it is not correct */
	CancelIo(s->hfile);
	qemu_aio_release(acb);
	}
	#endif /* #if WIN32_AIO */

	static void raw_flush(BlockDriverState *bs)
	{
	BDRVRawState *s = bs->opaque;
	FlushFileBuffers(s->hfile);
	}

	static void raw_close(BlockDriverState *bs)
	{
	BDRVRawState *s = bs->opaque;
	CloseHandle(s->hfile);
	}

	static int raw_truncate(BlockDriverState *bs, int64_t offset)
	{
	BDRVRawState *s = bs->opaque;
	DWORD low, high;

	low = offset;
	high = offset >> 32;
	if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN))
	return -EIO;
	if (!SetEndOfFile(s->hfile))
	return -EIO;
	return 0;
	}

	static int64_t raw_getlength(BlockDriverState *bs)
	{
	BDRVRawState *s = bs->opaque;
	LARGE_INTEGER l;
	ULARGE_INTEGER available, total, total_free;
	DISK_GEOMETRY_EX dg;
	DWORD count;
	BOOL status;

	switch(s->type) {
	case FTYPE_FILE:
	l.LowPart = GetFileSize(s->hfile, &l.HighPart);
	if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
	return -EIO;
	break;
	case FTYPE_CD:
	if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
	return -EIO;
	l.QuadPart = total.QuadPart;
	break;
	case FTYPE_HARDDISK:
	status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
	NULL, 0, &dg, sizeof(dg), &count, NULL);
	if (status != 0) {
	l = dg.DiskSize;
	}
	break;
	default:
	return -EIO;
	}
	return l.QuadPart;
	}

	static int raw_create(const char *filename, int64_t total_size,
	const char *backing_file, int flags)
	{
	int fd;

	if (flags \|\| backing_file)
	return -ENOTSUP;

	fd = open(filename, O_WRONLY \| O_CREAT \| O_TRUNC \| O_BINARY,
	0644);
	if (fd < 0)
	return -EIO;
	set_sparse(fd);
	ftruncate(fd, total_size * 512);
	close(fd);
	return 0;
	}

	BlockDriver bdrv_raw = {
	"raw",
	sizeof(BDRVRawState),
	NULL, /* no probe for protocols */
	raw_open,
	NULL,
	NULL,
	raw_close,
	raw_create,
	raw_flush,

	#ifdef WIN32_AIO
	.bdrv_aio_read = raw_aio_read,
	.bdrv_aio_write = raw_aio_write,
	.bdrv_aio_cancel = raw_aio_cancel,
	.aiocb_size = sizeof(RawAIOCB);
	#endif
	.bdrv_pread = raw_pread,
	.bdrv_pwrite = raw_pwrite,
	.bdrv_truncate = raw_truncate,
	.bdrv_getlength = raw_getlength,
	};

	/***********************************************/
	/* host device */

	static int find_cdrom(char *cdrom_name, int cdrom_name_size)
	{
	char drives[256], *pdrv = drives;
	UINT type;

	memset(drives, 0, sizeof(drives));
	GetLogicalDriveStrings(sizeof(drives), drives);
	while(pdrv[0] != '\0') {
	type = GetDriveType(pdrv);
	switch(type) {
	case DRIVE_CDROM:
	snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
	return 0;
	break;
	}
	pdrv += lstrlen(pdrv) + 1;
	}
	return -1;
	}

	static int find_device_type(BlockDriverState bs, const char filename)
	{
	BDRVRawState *s = bs->opaque;
	UINT type;
	const char *p;

	if (strstart(filename, "\\\\.\\", &p) \|\|
	strstart(filename, "//./", &p)) {
	if (stristart(p, "PhysicalDrive", NULL))
	return FTYPE_HARDDISK;
	snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
	type = GetDriveType(s->drive_path);
	if (type == DRIVE_CDROM)
	return FTYPE_CD;
	else
	return FTYPE_FILE;
	} else {
	return FTYPE_FILE;
	}
	}

	static int hdev_open(BlockDriverState bs, const char filename, int flags)
	{
	BDRVRawState *s = bs->opaque;
	int access_flags, create_flags;
	DWORD overlapped;
	char device_name[64];

	if (strstart(filename, "/dev/cdrom", NULL)) {
	if (find_cdrom(device_name, sizeof(device_name)) < 0)
	return -ENOENT;
	filename = device_name;
	} else {
	/* transform drive letters into device name */
	if (((filename[0] >= 'a' && filename[0] <= 'z') \|\|
	(filename[0] >= 'A' && filename[0] <= 'Z')) &&
	filename[1] == ':' && filename[2] == '\0') {
	snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
	filename = device_name;
	}
	}
	s->type = find_device_type(bs, filename);

	if ((flags & BDRV_O_ACCESS) == O_RDWR) {
	access_flags = GENERIC_READ \| GENERIC_WRITE;
	} else {
	access_flags = GENERIC_READ;
	}
	create_flags = OPEN_EXISTING;

	#ifdef WIN32_AIO
	overlapped = FILE_FLAG_OVERLAPPED;
	#else
	overlapped = FILE_ATTRIBUTE_NORMAL;
	#endif
	if ((flags & BDRV_O_NOCACHE))
	overlapped \|= FILE_FLAG_NO_BUFFERING \| FILE_FLAG_WRITE_THROUGH;
	else if (!(flags & BDRV_O_CACHE_WB))
	overlapped \|= FILE_FLAG_WRITE_THROUGH;
	s->hfile = CreateFile(filename, access_flags,
	FILE_SHARE_READ, NULL,
	create_flags, overlapped, NULL);
	if (s->hfile == INVALID_HANDLE_VALUE) {
	int err = GetLastError();

	if (err == ERROR_ACCESS_DENIED)
	return -EACCES;
	return -1;
	}
	return 0;
	}

	#if 0
	/***********************************************/
	/* removable device additional commands */

	static int raw_is_inserted(BlockDriverState *bs)
	{
	return 1;
	}

	static int raw_media_changed(BlockDriverState *bs)
	{
	return -ENOTSUP;
	}

	static int raw_eject(BlockDriverState *bs, int eject_flag)
	{
	DWORD ret_count;

	if (s->type == FTYPE_FILE)
	return -ENOTSUP;
	if (eject_flag) {
	DeviceIoControl(s->hfile, IOCTL_STORAGE_EJECT_MEDIA,
	NULL, 0, NULL, 0, &lpBytesReturned, NULL);
	} else {
	DeviceIoControl(s->hfile, IOCTL_STORAGE_LOAD_MEDIA,
	NULL, 0, NULL, 0, &lpBytesReturned, NULL);
	}
	}

	static int raw_set_locked(BlockDriverState *bs, int locked)
	{
	return -ENOTSUP;
	}
	#endif

	BlockDriver bdrv_host_device = {
	"host_device",
	sizeof(BDRVRawState),
	NULL, /* no probe for protocols */
	hdev_open,
	NULL,
	NULL,
	raw_close,
	NULL,
	raw_flush,

	#ifdef WIN32_AIO
	.bdrv_aio_read = raw_aio_read,
	.bdrv_aio_write = raw_aio_write,
	.bdrv_aio_cancel = raw_aio_cancel,
	.aiocb_size = sizeof(RawAIOCB);
	#endif
	.bdrv_pread = raw_pread,
	.bdrv_pwrite = raw_pwrite,
	.bdrv_getlength = raw_getlength,
	};