diff options
Diffstat (limited to 'block-raw-win32.c')
| -rw-r--r-- | block-raw-win32.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/block-raw-win32.c b/block-raw-win32.c new file mode 100644 index 000000000..db9995c04 --- /dev/null +++ b/block-raw-win32.c @@ -0,0 +1,544 @@ +/* + * 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" +#ifndef QEMU_IMG +#include "qemu-timer.h" +#include "exec-all.h" +#endif +#include "block_int.h" +#include <assert.h> +#include <winioctl.h> + +#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 QEMU_IMG + overlapped = FILE_ATTRIBUTE_NORMAL; +#else + overlapped = FILE_FLAG_OVERLAPPED; +#endif + 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) { + ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE); + if (!ret) + return -EIO; + else + 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) { + ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE); + if (!ret) + return -EIO; + else + return ret_count; + } + return ret_count; +} + +#if 0 +#ifndef QEMU_IMG +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); + } +} +#endif + +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; +#ifndef QEMU_IMG + qemu_add_wait_object(acb->ov.hEvent, raw_aio_cb, acb); +#endif + 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; + } +#ifdef QEMU_IMG + qemu_aio_release(acb); +#endif + 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; + } +#ifdef QEMU_IMG + qemu_aio_release(acb); +#endif + return (BlockDriverAIOCB *)acb; +} + +static void raw_aio_cancel(BlockDriverAIOCB *blockacb) +{ +#ifndef QEMU_IMG + 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 +} +#endif /* #if 0 */ + +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; +} + +void qemu_aio_init(void) +{ +} + +void qemu_aio_poll(void) +{ +} + +void qemu_aio_flush(void) +{ +} + +void qemu_aio_wait_start(void) +{ +} + +void qemu_aio_wait(void) +{ +#ifndef QEMU_IMG + qemu_bh_poll(); +#endif +} + +void qemu_aio_wait_end(void) +{ +} + +BlockDriver bdrv_raw = { + "raw", + sizeof(BDRVRawState), + NULL, /* no probe for protocols */ + raw_open, + NULL, + NULL, + raw_close, + raw_create, + raw_flush, + +#if 0 + .bdrv_aio_read = raw_aio_read, + .bdrv_aio_write = raw_aio_write, + .bdrv_aio_cancel = raw_aio_cancel, + .aiocb_size = sizeof(RawAIOCB); +#endif + .protocol_name = "file", + .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 QEMU_IMG + overlapped = FILE_ATTRIBUTE_NORMAL; +#else + overlapped = FILE_FLAG_OVERLAPPED; +#endif + 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, + +#if 0 + .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, +}; |