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/*
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* Block driver for RAW files (win32)
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*
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* Copyright (c) 2006 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h" |
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#include "qemu-timer.h" |
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#include "block_int.h" |
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#include "module.h" |
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#include "raw-aio.h" |
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#include "trace.h" |
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#include "thread-pool.h" |
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#include "iov.h" |
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#include <windows.h> |
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#include <winioctl.h> |
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#define FTYPE_FILE 0 |
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#define FTYPE_CD 1 |
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#define FTYPE_HARDDISK 2 |
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static QEMUWin32AIOState *aio;
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|
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typedef struct RawWin32AIOData { |
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BlockDriverState *bs; |
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HANDLE hfile; |
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struct iovec *aio_iov;
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int aio_niov;
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size_t aio_nbytes; |
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off64_t aio_offset; |
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int aio_type;
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} RawWin32AIOData; |
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|
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typedef struct BDRVRawState { |
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HANDLE hfile; |
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int type;
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char drive_path[16]; /* format: "d:\" */ |
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QEMUWin32AIOState *aio; |
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} BDRVRawState; |
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/*
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* Read/writes the data to/from a given linear buffer.
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*
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* Returns the number of bytes handles or -errno in case of an error. Short
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* reads are only returned if the end of the file is reached.
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*/
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static size_t handle_aiocb_rw(RawWin32AIOData *aiocb)
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{ |
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size_t offset = 0;
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int i;
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for (i = 0; i < aiocb->aio_niov; i++) { |
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OVERLAPPED ov; |
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DWORD ret, ret_count, len; |
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|
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memset(&ov, 0, sizeof(ov)); |
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ov.Offset = (aiocb->aio_offset + offset); |
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ov.OffsetHigh = (aiocb->aio_offset + offset) >> 32;
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len = aiocb->aio_iov[i].iov_len; |
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if (aiocb->aio_type & QEMU_AIO_WRITE) {
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ret = WriteFile(aiocb->hfile, aiocb->aio_iov[i].iov_base, |
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len, &ret_count, &ov); |
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} else {
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ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base, |
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len, &ret_count, &ov); |
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} |
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if (!ret) {
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ret_count = 0;
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} |
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if (ret_count != len) {
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break;
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} |
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offset += len; |
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} |
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return offset;
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} |
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static int aio_worker(void *arg) |
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{ |
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RawWin32AIOData *aiocb = arg; |
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ssize_t ret = 0;
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size_t count; |
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switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
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case QEMU_AIO_READ:
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count = handle_aiocb_rw(aiocb); |
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if (count < aiocb->aio_nbytes && aiocb->bs->growable) {
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/* A short read means that we have reached EOF. Pad the buffer
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* with zeros for bytes after EOF. */
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iov_memset(aiocb->aio_iov, aiocb->aio_niov, count, |
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0, aiocb->aio_nbytes - count);
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count = aiocb->aio_nbytes; |
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} |
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if (count == aiocb->aio_nbytes) {
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ret = 0;
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} else {
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ret = -EINVAL; |
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} |
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break;
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case QEMU_AIO_WRITE:
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count = handle_aiocb_rw(aiocb); |
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if (count == aiocb->aio_nbytes) {
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count = 0;
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} else {
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count = -EINVAL; |
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} |
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break;
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case QEMU_AIO_FLUSH:
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if (!FlushFileBuffers(aiocb->hfile)) {
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return -EIO;
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} |
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break;
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default:
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fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
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ret = -EINVAL; |
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break;
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} |
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g_slice_free(RawWin32AIOData, aiocb); |
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return ret;
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} |
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static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque, int type) |
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{ |
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RawWin32AIOData *acb = g_slice_new(RawWin32AIOData); |
147 |
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acb->bs = bs; |
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acb->hfile = hfile; |
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acb->aio_type = type; |
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|
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if (qiov) {
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acb->aio_iov = qiov->iov; |
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acb->aio_niov = qiov->niov; |
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} |
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acb->aio_nbytes = nb_sectors * 512;
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acb->aio_offset = sector_num * 512;
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trace_paio_submit(acb, opaque, sector_num, nb_sectors, type); |
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return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
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} |
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int qemu_ftruncate64(int fd, int64_t length) |
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{ |
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LARGE_INTEGER li; |
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DWORD dw; |
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LONG high; |
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HANDLE h; |
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BOOL res; |
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if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0) |
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return -1; |
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h = (HANDLE)_get_osfhandle(fd); |
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/* get current position, ftruncate do not change position */
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li.HighPart = 0;
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li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
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if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
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return -1; |
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} |
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high = length >> 32;
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dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN); |
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if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
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return -1; |
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} |
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res = SetEndOfFile(h); |
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/* back to old position */
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SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN); |
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return res ? 0 : -1; |
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} |
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static int set_sparse(int fd) |
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{ |
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DWORD returned; |
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return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE, |
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NULL, 0, NULL, 0, &returned, NULL); |
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} |
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static void raw_parse_flags(int flags, int *access_flags, DWORD *overlapped) |
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{ |
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assert(access_flags != NULL);
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assert(overlapped != NULL);
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if (flags & BDRV_O_RDWR) {
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*access_flags = GENERIC_READ | GENERIC_WRITE; |
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} else {
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*access_flags = GENERIC_READ; |
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} |
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*overlapped = FILE_ATTRIBUTE_NORMAL; |
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if (flags & BDRV_O_NATIVE_AIO) {
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*overlapped |= FILE_FLAG_OVERLAPPED; |
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} |
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if (flags & BDRV_O_NOCACHE) {
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*overlapped |= FILE_FLAG_NO_BUFFERING; |
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} |
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} |
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static int raw_open(BlockDriverState *bs, const char *filename, int flags) |
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{ |
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BDRVRawState *s = bs->opaque; |
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int access_flags;
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DWORD overlapped; |
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s->type = FTYPE_FILE; |
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raw_parse_flags(flags, &access_flags, &overlapped); |
231 |
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if ((flags & BDRV_O_NATIVE_AIO) && aio == NULL) { |
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aio = win32_aio_init(); |
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if (aio == NULL) { |
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return -EINVAL;
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} |
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} |
238 |
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s->hfile = CreateFile(filename, access_flags, |
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FILE_SHARE_READ, NULL,
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OPEN_EXISTING, overlapped, NULL);
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if (s->hfile == INVALID_HANDLE_VALUE) {
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int err = GetLastError();
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if (err == ERROR_ACCESS_DENIED)
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return -EACCES;
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return -EINVAL;
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} |
249 |
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if (flags & BDRV_O_NATIVE_AIO) {
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int ret = win32_aio_attach(aio, s->hfile);
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if (ret < 0) { |
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CloseHandle(s->hfile); |
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return ret;
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} |
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s->aio = aio; |
257 |
} |
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return 0; |
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} |
260 |
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static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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{ |
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BDRVRawState *s = bs->opaque; |
266 |
if (s->aio) {
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return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
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nb_sectors, cb, opaque, QEMU_AIO_READ); |
269 |
} else {
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return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
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cb, opaque, QEMU_AIO_READ); |
272 |
} |
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} |
274 |
|
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static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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{ |
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BDRVRawState *s = bs->opaque; |
280 |
if (s->aio) {
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return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
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nb_sectors, cb, opaque, QEMU_AIO_WRITE); |
283 |
} else {
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return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
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cb, opaque, QEMU_AIO_WRITE); |
286 |
} |
287 |
} |
288 |
|
289 |
static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque)
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{ |
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BDRVRawState *s = bs->opaque; |
293 |
return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH); |
294 |
} |
295 |
|
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static void raw_close(BlockDriverState *bs) |
297 |
{ |
298 |
BDRVRawState *s = bs->opaque; |
299 |
CloseHandle(s->hfile); |
300 |
} |
301 |
|
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static int raw_truncate(BlockDriverState *bs, int64_t offset) |
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{ |
304 |
BDRVRawState *s = bs->opaque; |
305 |
LONG low, high; |
306 |
|
307 |
low = offset; |
308 |
high = offset >> 32;
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309 |
if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN))
|
310 |
return -EIO;
|
311 |
if (!SetEndOfFile(s->hfile))
|
312 |
return -EIO;
|
313 |
return 0; |
314 |
} |
315 |
|
316 |
static int64_t raw_getlength(BlockDriverState *bs)
|
317 |
{ |
318 |
BDRVRawState *s = bs->opaque; |
319 |
LARGE_INTEGER l; |
320 |
ULARGE_INTEGER available, total, total_free; |
321 |
DISK_GEOMETRY_EX dg; |
322 |
DWORD count; |
323 |
BOOL status; |
324 |
|
325 |
switch(s->type) {
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326 |
case FTYPE_FILE:
|
327 |
l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart); |
328 |
if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR) |
329 |
return -EIO;
|
330 |
break;
|
331 |
case FTYPE_CD:
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332 |
if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
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333 |
return -EIO;
|
334 |
l.QuadPart = total.QuadPart; |
335 |
break;
|
336 |
case FTYPE_HARDDISK:
|
337 |
status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX, |
338 |
NULL, 0, &dg, sizeof(dg), &count, NULL); |
339 |
if (status != 0) { |
340 |
l = dg.DiskSize; |
341 |
} |
342 |
break;
|
343 |
default:
|
344 |
return -EIO;
|
345 |
} |
346 |
return l.QuadPart;
|
347 |
} |
348 |
|
349 |
static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
|
350 |
{ |
351 |
typedef DWORD (WINAPI * get_compressed_t)(const char *filename, |
352 |
DWORD * high); |
353 |
get_compressed_t get_compressed; |
354 |
struct _stati64 st;
|
355 |
const char *filename = bs->filename; |
356 |
/* WinNT support GetCompressedFileSize to determine allocate size */
|
357 |
get_compressed = |
358 |
(get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
|
359 |
"GetCompressedFileSizeA");
|
360 |
if (get_compressed) {
|
361 |
DWORD high, low; |
362 |
low = get_compressed(filename, &high); |
363 |
if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) { |
364 |
return (((int64_t) high) << 32) + low; |
365 |
} |
366 |
} |
367 |
|
368 |
if (_stati64(filename, &st) < 0) { |
369 |
return -1; |
370 |
} |
371 |
return st.st_size;
|
372 |
} |
373 |
|
374 |
static int raw_create(const char *filename, QEMUOptionParameter *options) |
375 |
{ |
376 |
int fd;
|
377 |
int64_t total_size = 0;
|
378 |
|
379 |
/* Read out options */
|
380 |
while (options && options->name) {
|
381 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
382 |
total_size = options->value.n / 512;
|
383 |
} |
384 |
options++; |
385 |
} |
386 |
|
387 |
fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, |
388 |
0644);
|
389 |
if (fd < 0) |
390 |
return -EIO;
|
391 |
set_sparse(fd); |
392 |
ftruncate(fd, total_size * 512);
|
393 |
qemu_close(fd); |
394 |
return 0; |
395 |
} |
396 |
|
397 |
static QEMUOptionParameter raw_create_options[] = {
|
398 |
{ |
399 |
.name = BLOCK_OPT_SIZE, |
400 |
.type = OPT_SIZE, |
401 |
.help = "Virtual disk size"
|
402 |
}, |
403 |
{ NULL }
|
404 |
}; |
405 |
|
406 |
static BlockDriver bdrv_file = {
|
407 |
.format_name = "file",
|
408 |
.protocol_name = "file",
|
409 |
.instance_size = sizeof(BDRVRawState),
|
410 |
.bdrv_file_open = raw_open, |
411 |
.bdrv_close = raw_close, |
412 |
.bdrv_create = raw_create, |
413 |
|
414 |
.bdrv_aio_readv = raw_aio_readv, |
415 |
.bdrv_aio_writev = raw_aio_writev, |
416 |
.bdrv_aio_flush = raw_aio_flush, |
417 |
|
418 |
.bdrv_truncate = raw_truncate, |
419 |
.bdrv_getlength = raw_getlength, |
420 |
.bdrv_get_allocated_file_size |
421 |
= raw_get_allocated_file_size, |
422 |
|
423 |
.create_options = raw_create_options, |
424 |
}; |
425 |
|
426 |
/***********************************************/
|
427 |
/* host device */
|
428 |
|
429 |
static int find_cdrom(char *cdrom_name, int cdrom_name_size) |
430 |
{ |
431 |
char drives[256], *pdrv = drives; |
432 |
UINT type; |
433 |
|
434 |
memset(drives, 0, sizeof(drives)); |
435 |
GetLogicalDriveStrings(sizeof(drives), drives);
|
436 |
while(pdrv[0] != '\0') { |
437 |
type = GetDriveType(pdrv); |
438 |
switch(type) {
|
439 |
case DRIVE_CDROM:
|
440 |
snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]); |
441 |
return 0; |
442 |
break;
|
443 |
} |
444 |
pdrv += lstrlen(pdrv) + 1;
|
445 |
} |
446 |
return -1; |
447 |
} |
448 |
|
449 |
static int find_device_type(BlockDriverState *bs, const char *filename) |
450 |
{ |
451 |
BDRVRawState *s = bs->opaque; |
452 |
UINT type; |
453 |
const char *p; |
454 |
|
455 |
if (strstart(filename, "\\\\.\\", &p) || |
456 |
strstart(filename, "//./", &p)) {
|
457 |
if (stristart(p, "PhysicalDrive", NULL)) |
458 |
return FTYPE_HARDDISK;
|
459 |
snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]); |
460 |
type = GetDriveType(s->drive_path); |
461 |
switch (type) {
|
462 |
case DRIVE_REMOVABLE:
|
463 |
case DRIVE_FIXED:
|
464 |
return FTYPE_HARDDISK;
|
465 |
case DRIVE_CDROM:
|
466 |
return FTYPE_CD;
|
467 |
default:
|
468 |
return FTYPE_FILE;
|
469 |
} |
470 |
} else {
|
471 |
return FTYPE_FILE;
|
472 |
} |
473 |
} |
474 |
|
475 |
static int hdev_probe_device(const char *filename) |
476 |
{ |
477 |
if (strstart(filename, "/dev/cdrom", NULL)) |
478 |
return 100; |
479 |
if (is_windows_drive(filename))
|
480 |
return 100; |
481 |
return 0; |
482 |
} |
483 |
|
484 |
static int hdev_open(BlockDriverState *bs, const char *filename, int flags) |
485 |
{ |
486 |
BDRVRawState *s = bs->opaque; |
487 |
int access_flags, create_flags;
|
488 |
DWORD overlapped; |
489 |
char device_name[64]; |
490 |
|
491 |
if (strstart(filename, "/dev/cdrom", NULL)) { |
492 |
if (find_cdrom(device_name, sizeof(device_name)) < 0) |
493 |
return -ENOENT;
|
494 |
filename = device_name; |
495 |
} else {
|
496 |
/* transform drive letters into device name */
|
497 |
if (((filename[0] >= 'a' && filename[0] <= 'z') || |
498 |
(filename[0] >= 'A' && filename[0] <= 'Z')) && |
499 |
filename[1] == ':' && filename[2] == '\0') { |
500 |
snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]); |
501 |
filename = device_name; |
502 |
} |
503 |
} |
504 |
s->type = find_device_type(bs, filename); |
505 |
|
506 |
raw_parse_flags(flags, &access_flags, &overlapped); |
507 |
|
508 |
create_flags = OPEN_EXISTING; |
509 |
|
510 |
s->hfile = CreateFile(filename, access_flags, |
511 |
FILE_SHARE_READ, NULL,
|
512 |
create_flags, overlapped, NULL);
|
513 |
if (s->hfile == INVALID_HANDLE_VALUE) {
|
514 |
int err = GetLastError();
|
515 |
|
516 |
if (err == ERROR_ACCESS_DENIED)
|
517 |
return -EACCES;
|
518 |
return -1; |
519 |
} |
520 |
return 0; |
521 |
} |
522 |
|
523 |
static int hdev_has_zero_init(BlockDriverState *bs) |
524 |
{ |
525 |
return 0; |
526 |
} |
527 |
|
528 |
static BlockDriver bdrv_host_device = {
|
529 |
.format_name = "host_device",
|
530 |
.protocol_name = "host_device",
|
531 |
.instance_size = sizeof(BDRVRawState),
|
532 |
.bdrv_probe_device = hdev_probe_device, |
533 |
.bdrv_file_open = hdev_open, |
534 |
.bdrv_close = raw_close, |
535 |
.bdrv_has_zero_init = hdev_has_zero_init, |
536 |
|
537 |
.bdrv_aio_readv = raw_aio_readv, |
538 |
.bdrv_aio_writev = raw_aio_writev, |
539 |
.bdrv_aio_flush = raw_aio_flush, |
540 |
|
541 |
.bdrv_getlength = raw_getlength, |
542 |
.bdrv_get_allocated_file_size |
543 |
= raw_get_allocated_file_size, |
544 |
}; |
545 |
|
546 |
static void bdrv_file_init(void) |
547 |
{ |
548 |
bdrv_register(&bdrv_file); |
549 |
bdrv_register(&bdrv_host_device); |
550 |
} |
551 |
|
552 |
block_init(bdrv_file_init); |