BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs, QEMUWin32AIOState *aio, HANDLE hfile, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque, int type) { struct QEMUWin32AIOCB *waiocb; uint64_t offset = sector_num * 512; DWORD rc; waiocb = qemu_aio_get(&win32_aio_pool, bs, cb, opaque); waiocb->nbytes = nb_sectors * 512; waiocb->qiov = qiov; waiocb->is_read = (type == QEMU_AIO_READ); if (qiov->niov > 1) { waiocb->buf = qemu_blockalign(bs, qiov->size); if (type & QEMU_AIO_WRITE) { char *p = waiocb->buf; int i; for (i = 0; i < qiov->niov; ++i) { memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len); p += qiov->iov[i].iov_len; } } waiocb->is_linear = false; } else { waiocb->buf = qiov->iov[0].iov_base; waiocb->is_linear = true; } waiocb->ov = (OVERLAPPED) { .Offset = (DWORD) offset, .OffsetHigh = (DWORD) (offset >> 32), .hEvent = event_notifier_get_handle(&aio->e) }; aio->count++; if (type & QEMU_AIO_READ) { rc = ReadFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov); } else { rc = WriteFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov); } if(rc == 0 && GetLastError() != ERROR_IO_PENDING) { goto out_dec_count; } return &waiocb->common; out_dec_count: aio->count--; qemu_aio_release(waiocb); return NULL; }