fbcad04d6b
An error has occurred if the return value is invalid_set_file_pointer and getlasterror doesn't return no_error. Signed-off-by: Fabien Chouteau <chouteau@adacore.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
564 lines
16 KiB
C
564 lines
16 KiB
C
/*
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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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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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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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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);
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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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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);
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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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}
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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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}
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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;
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}
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return 0;
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}
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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;
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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);
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} 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);
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}
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}
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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;
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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);
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} 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);
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}
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}
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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;
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return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
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}
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static void raw_close(BlockDriverState *bs)
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{
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BDRVRawState *s = bs->opaque;
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CloseHandle(s->hfile);
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}
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static int raw_truncate(BlockDriverState *bs, int64_t offset)
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{
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BDRVRawState *s = bs->opaque;
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LONG low, high;
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DWORD dwPtrLow;
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low = offset;
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high = offset >> 32;
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/*
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* An error has occurred if the return value is INVALID_SET_FILE_POINTER
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* and GetLastError doesn't return NO_ERROR.
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*/
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dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
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if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
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fprintf(stderr, "SetFilePointer error: %d\n", GetLastError());
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return -EIO;
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}
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if (SetEndOfFile(s->hfile) == 0) {
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fprintf(stderr, "SetEndOfFile error: %d\n", GetLastError());
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return -EIO;
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}
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return 0;
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}
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static int64_t raw_getlength(BlockDriverState *bs)
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{
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BDRVRawState *s = bs->opaque;
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LARGE_INTEGER l;
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ULARGE_INTEGER available, total, total_free;
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DISK_GEOMETRY_EX dg;
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DWORD count;
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BOOL status;
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switch(s->type) {
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case FTYPE_FILE:
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l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
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if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
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return -EIO;
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break;
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case FTYPE_CD:
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if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
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return -EIO;
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l.QuadPart = total.QuadPart;
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break;
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case FTYPE_HARDDISK:
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status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
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NULL, 0, &dg, sizeof(dg), &count, NULL);
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if (status != 0) {
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l = dg.DiskSize;
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}
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break;
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default:
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return -EIO;
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}
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return l.QuadPart;
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}
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static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
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{
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typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
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DWORD * high);
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get_compressed_t get_compressed;
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struct _stati64 st;
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const char *filename = bs->filename;
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/* WinNT support GetCompressedFileSize to determine allocate size */
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get_compressed =
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(get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
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"GetCompressedFileSizeA");
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if (get_compressed) {
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DWORD high, low;
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low = get_compressed(filename, &high);
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if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
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return (((int64_t) high) << 32) + low;
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}
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}
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if (_stati64(filename, &st) < 0) {
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return -1;
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}
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return st.st_size;
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}
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static int raw_create(const char *filename, QEMUOptionParameter *options)
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{
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int fd;
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int64_t total_size = 0;
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/* Read out options */
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while (options && options->name) {
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if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
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total_size = options->value.n / 512;
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}
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options++;
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}
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fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
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0644);
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if (fd < 0)
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return -EIO;
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set_sparse(fd);
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ftruncate(fd, total_size * 512);
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qemu_close(fd);
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return 0;
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}
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static QEMUOptionParameter raw_create_options[] = {
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{
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.name = BLOCK_OPT_SIZE,
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.type = OPT_SIZE,
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.help = "Virtual disk size"
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},
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{ NULL }
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};
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static BlockDriver bdrv_file = {
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.format_name = "file",
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.protocol_name = "file",
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.instance_size = sizeof(BDRVRawState),
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.bdrv_file_open = raw_open,
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.bdrv_close = raw_close,
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.bdrv_create = raw_create,
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.bdrv_aio_readv = raw_aio_readv,
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.bdrv_aio_writev = raw_aio_writev,
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.bdrv_aio_flush = raw_aio_flush,
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.bdrv_truncate = raw_truncate,
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.bdrv_getlength = raw_getlength,
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.bdrv_get_allocated_file_size
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= raw_get_allocated_file_size,
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.create_options = raw_create_options,
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};
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/***********************************************/
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/* host device */
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static int find_cdrom(char *cdrom_name, int cdrom_name_size)
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{
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char drives[256], *pdrv = drives;
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UINT type;
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memset(drives, 0, sizeof(drives));
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GetLogicalDriveStrings(sizeof(drives), drives);
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while(pdrv[0] != '\0') {
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type = GetDriveType(pdrv);
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switch(type) {
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case DRIVE_CDROM:
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snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
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return 0;
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break;
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}
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pdrv += lstrlen(pdrv) + 1;
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}
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return -1;
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}
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static int find_device_type(BlockDriverState *bs, const char *filename)
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{
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BDRVRawState *s = bs->opaque;
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UINT type;
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const char *p;
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if (strstart(filename, "\\\\.\\", &p) ||
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strstart(filename, "//./", &p)) {
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if (stristart(p, "PhysicalDrive", NULL))
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return FTYPE_HARDDISK;
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snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
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type = GetDriveType(s->drive_path);
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switch (type) {
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case DRIVE_REMOVABLE:
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case DRIVE_FIXED:
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return FTYPE_HARDDISK;
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case DRIVE_CDROM:
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return FTYPE_CD;
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default:
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return FTYPE_FILE;
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}
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} else {
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return FTYPE_FILE;
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}
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}
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static int hdev_probe_device(const char *filename)
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{
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if (strstart(filename, "/dev/cdrom", NULL))
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return 100;
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if (is_windows_drive(filename))
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return 100;
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return 0;
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}
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static int hdev_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, create_flags;
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DWORD overlapped;
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char device_name[64];
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if (strstart(filename, "/dev/cdrom", NULL)) {
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if (find_cdrom(device_name, sizeof(device_name)) < 0)
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return -ENOENT;
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filename = device_name;
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} 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);
|
|
|
|
raw_parse_flags(flags, &access_flags, &overlapped);
|
|
|
|
create_flags = OPEN_EXISTING;
|
|
|
|
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 hdev_has_zero_init(BlockDriverState *bs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static BlockDriver bdrv_host_device = {
|
|
.format_name = "host_device",
|
|
.protocol_name = "host_device",
|
|
.instance_size = sizeof(BDRVRawState),
|
|
.bdrv_probe_device = hdev_probe_device,
|
|
.bdrv_file_open = hdev_open,
|
|
.bdrv_close = raw_close,
|
|
.bdrv_has_zero_init = hdev_has_zero_init,
|
|
|
|
.bdrv_aio_readv = raw_aio_readv,
|
|
.bdrv_aio_writev = raw_aio_writev,
|
|
.bdrv_aio_flush = raw_aio_flush,
|
|
|
|
.bdrv_getlength = raw_getlength,
|
|
.bdrv_get_allocated_file_size
|
|
= raw_get_allocated_file_size,
|
|
};
|
|
|
|
static void bdrv_file_init(void)
|
|
{
|
|
bdrv_register(&bdrv_file);
|
|
bdrv_register(&bdrv_host_device);
|
|
}
|
|
|
|
block_init(bdrv_file_init);
|