--- /dev/null
+/*
+ * 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"
+#include "qemu/timer.h"
+#include "block/block_int.h"
+#include "qemu/module.h"
+#include "block/aio.h"
+#include "raw-aio.h"
+#include "qemu/event_notifier.h"
+#include "qemu/iov.h"
+#include <windows.h>
+#include <winioctl.h>
+
+#define FTYPE_FILE 0
+#define FTYPE_CD 1
+#define FTYPE_HARDDISK 2
+
+struct QEMUWin32AIOState {
+ HANDLE hIOCP;
+ EventNotifier e;
+ int count;
+ bool is_aio_context_attached;
+};
+
+typedef struct QEMUWin32AIOCB {
+ BlockAIOCB common;
+ struct QEMUWin32AIOState *ctx;
+ int nbytes;
+ OVERLAPPED ov;
+ QEMUIOVector *qiov;
+ void *buf;
+ bool is_read;
+ bool is_linear;
+} QEMUWin32AIOCB;
+
+/*
+ * Completes an AIO request (calls the callback and frees the ACB).
+ */
+static void win32_aio_process_completion(QEMUWin32AIOState *s,
+ QEMUWin32AIOCB *waiocb, DWORD count)
+{
+ int ret;
+ s->count--;
+
+ if (waiocb->ov.Internal != 0) {
+ ret = -EIO;
+ } else {
+ ret = 0;
+ if (count < waiocb->nbytes) {
+ /* Short reads mean EOF, pad with zeros. */
+ if (waiocb->is_read) {
+ qemu_iovec_memset(waiocb->qiov, count, 0,
+ waiocb->qiov->size - count);
+ } else {
+ ret = -EINVAL;
+ }
+ }
+ }
+
+ if (!waiocb->is_linear) {
+ if (ret == 0 && waiocb->is_read) {
+ QEMUIOVector *qiov = waiocb->qiov;
+ iov_from_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size);
+ }
+ qemu_vfree(waiocb->buf);
+ }
+
+
+ waiocb->common.cb(waiocb->common.opaque, ret);
+ qemu_aio_unref(waiocb);
+}
+
+static void win32_aio_completion_cb(EventNotifier *e)
+{
+ QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e);
+ DWORD count;
+ ULONG_PTR key;
+ OVERLAPPED *ov;
+
+ event_notifier_test_and_clear(&s->e);
+ while (GetQueuedCompletionStatus(s->hIOCP, &count, &key, &ov, 0)) {
+ QEMUWin32AIOCB *waiocb = container_of(ov, QEMUWin32AIOCB, ov);
+
+ win32_aio_process_completion(s, waiocb, count);
+ }
+}
+
+static const AIOCBInfo win32_aiocb_info = {
+ .aiocb_size = sizeof(QEMUWin32AIOCB),
+};
+
+BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
+ QEMUWin32AIOState *aio, HANDLE hfile,
+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+ BlockCompletionFunc *cb, void *opaque, int type)
+{
+ struct QEMUWin32AIOCB *waiocb;
+ uint64_t offset = sector_num * 512;
+ DWORD rc;
+
+ waiocb = qemu_aio_get(&win32_aiocb_info, 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_try_blockalign(bs, qiov->size);
+ if (waiocb->buf == NULL) {
+ goto out;
+ }
+ if (type & QEMU_AIO_WRITE) {
+ iov_to_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size);
+ }
+ waiocb->is_linear = false;
+ } else {
+ waiocb->buf = qiov->iov[0].iov_base;
+ waiocb->is_linear = true;
+ }
+
+ memset(&waiocb->ov, 0, sizeof(waiocb->ov));
+ waiocb->ov.Offset = (DWORD)offset;
+ waiocb->ov.OffsetHigh = (DWORD)(offset >> 32);
+ waiocb->ov.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--;
+out:
+ qemu_aio_unref(waiocb);
+ return NULL;
+}
+
+int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile)
+{
+ if (CreateIoCompletionPort(hfile, aio->hIOCP, (ULONG_PTR) 0, 0) == NULL) {
+ return -EINVAL;
+ } else {
+ return 0;
+ }
+}
+
+void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
+ AioContext *old_context)
+{
+ aio_set_event_notifier(old_context, &aio->e, NULL);
+ aio->is_aio_context_attached = false;
+}
+
+void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
+ AioContext *new_context)
+{
+ aio->is_aio_context_attached = true;
+ aio_set_event_notifier(new_context, &aio->e, win32_aio_completion_cb);
+}
+
+QEMUWin32AIOState *win32_aio_init(void)
+{
+ QEMUWin32AIOState *s;
+
+ s = g_malloc0(sizeof(*s));
+ if (event_notifier_init(&s->e, false) < 0) {
+ goto out_free_state;
+ }
+
+ s->hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
+ if (s->hIOCP == NULL) {
+ goto out_close_efd;
+ }
+
+ return s;
+
+out_close_efd:
+ event_notifier_cleanup(&s->e);
+out_free_state:
+ g_free(s);
+ return NULL;
+}
+
+void win32_aio_cleanup(QEMUWin32AIOState *aio)
+{
+ assert(!aio->is_aio_context_attached);
+ CloseHandle(aio->hIOCP);
+ event_notifier_cleanup(&aio->e);
+ g_free(aio);
+}
Code Review / kvmfornfv.git / blobdiff