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raw-win32: add emulated AIO support
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
parent
9f8540ecef
commit
fc4edb84bf
@ -25,6 +25,10 @@
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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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@ -32,12 +36,127 @@
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#define FTYPE_CD 1
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#define FTYPE_HARDDISK 2
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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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} 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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@ -117,59 +236,29 @@ static int raw_open(BlockDriverState *bs, const char *filename, int flags)
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return 0;
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}
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static int raw_read(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors)
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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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OVERLAPPED ov;
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DWORD ret_count;
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int ret;
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int64_t offset = sector_num * 512;
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int count = nb_sectors * 512;
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memset(&ov, 0, sizeof(ov));
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ov.Offset = offset;
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ov.OffsetHigh = offset >> 32;
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ret = ReadFile(s->hfile, buf, count, &ret_count, &ov);
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if (!ret)
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return ret_count;
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if (ret_count == count)
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ret_count = 0;
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return ret_count;
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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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static int raw_write(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors)
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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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OVERLAPPED ov;
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DWORD ret_count;
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int ret;
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int64_t offset = sector_num * 512;
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int count = nb_sectors * 512;
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memset(&ov, 0, sizeof(ov));
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ov.Offset = offset;
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ov.OffsetHigh = offset >> 32;
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ret = WriteFile(s->hfile, buf, count, &ret_count, &ov);
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if (!ret)
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return ret_count;
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if (ret_count == count)
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ret_count = 0;
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return ret_count;
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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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static int raw_flush(BlockDriverState *bs)
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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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int ret;
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ret = FlushFileBuffers(s->hfile);
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if (ret == 0) {
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return -EIO;
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}
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return 0;
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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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@ -290,9 +379,9 @@ static BlockDriver bdrv_file = {
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.bdrv_close = raw_close,
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.bdrv_create = raw_create,
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.bdrv_read = raw_read,
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.bdrv_write = raw_write,
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.bdrv_co_flush_to_disk = raw_flush,
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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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@ -413,9 +502,9 @@ static BlockDriver bdrv_host_device = {
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.bdrv_close = raw_close,
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.bdrv_has_zero_init = hdev_has_zero_init,
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.bdrv_read = raw_read,
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.bdrv_write = raw_write,
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.bdrv_co_flush_to_disk = raw_flush,
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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_getlength = raw_getlength,
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.bdrv_get_allocated_file_size
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