mirror of https://github.com/proxmox/mirror_qemu
181 lines
5.0 KiB
C
181 lines
5.0 KiB
C
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/*
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* QEMUFile backend for QIOChannel objects
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*
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* Copyright (c) 2015-2016 Red Hat, Inc
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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/osdep.h"
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#include "migration/qemu-file.h"
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#include "io/channel-socket.h"
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#include "qemu/iov.h"
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static ssize_t channel_writev_buffer(void *opaque,
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struct iovec *iov,
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int iovcnt,
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int64_t pos)
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{
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QIOChannel *ioc = QIO_CHANNEL(opaque);
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ssize_t done = 0;
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struct iovec *local_iov = g_new(struct iovec, iovcnt);
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struct iovec *local_iov_head = local_iov;
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unsigned int nlocal_iov = iovcnt;
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nlocal_iov = iov_copy(local_iov, nlocal_iov,
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iov, iovcnt,
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0, iov_size(iov, iovcnt));
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while (nlocal_iov > 0) {
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ssize_t len;
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len = qio_channel_writev(ioc, local_iov, nlocal_iov, NULL);
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if (len == QIO_CHANNEL_ERR_BLOCK) {
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qio_channel_wait(ioc, G_IO_OUT);
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continue;
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}
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if (len < 0) {
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/* XXX handle Error objects */
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done = -EIO;
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goto cleanup;
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}
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iov_discard_front(&local_iov, &nlocal_iov, len);
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done += len;
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}
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cleanup:
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g_free(local_iov_head);
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return done;
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}
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static ssize_t channel_get_buffer(void *opaque,
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uint8_t *buf,
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int64_t pos,
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size_t size)
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{
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QIOChannel *ioc = QIO_CHANNEL(opaque);
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ssize_t ret;
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do {
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ret = qio_channel_read(ioc, (char *)buf, size, NULL);
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if (ret < 0) {
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if (ret == QIO_CHANNEL_ERR_BLOCK) {
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qio_channel_yield(ioc, G_IO_IN);
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} else {
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/* XXX handle Error * object */
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return -EIO;
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}
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}
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} while (ret == QIO_CHANNEL_ERR_BLOCK);
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return ret;
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}
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static int channel_close(void *opaque)
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{
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QIOChannel *ioc = QIO_CHANNEL(opaque);
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qio_channel_close(ioc, NULL);
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object_unref(OBJECT(ioc));
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return 0;
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}
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static int channel_shutdown(void *opaque,
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bool rd,
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bool wr)
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{
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QIOChannel *ioc = QIO_CHANNEL(opaque);
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if (qio_channel_has_feature(ioc,
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QIO_CHANNEL_FEATURE_SHUTDOWN)) {
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QIOChannelShutdown mode;
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if (rd && wr) {
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mode = QIO_CHANNEL_SHUTDOWN_BOTH;
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} else if (rd) {
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mode = QIO_CHANNEL_SHUTDOWN_READ;
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} else {
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mode = QIO_CHANNEL_SHUTDOWN_WRITE;
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}
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if (qio_channel_shutdown(ioc, mode, NULL) < 0) {
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/* XXX handler Error * object */
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return -EIO;
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}
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}
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return 0;
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}
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static int channel_set_blocking(void *opaque,
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bool enabled)
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{
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QIOChannel *ioc = QIO_CHANNEL(opaque);
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if (qio_channel_set_blocking(ioc, enabled, NULL) < 0) {
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return -1;
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}
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return 0;
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}
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static QEMUFile *channel_get_input_return_path(void *opaque)
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{
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QIOChannel *ioc = QIO_CHANNEL(opaque);
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return qemu_fopen_channel_output(ioc);
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}
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static QEMUFile *channel_get_output_return_path(void *opaque)
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{
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QIOChannel *ioc = QIO_CHANNEL(opaque);
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return qemu_fopen_channel_input(ioc);
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}
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static const QEMUFileOps channel_input_ops = {
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.get_buffer = channel_get_buffer,
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.close = channel_close,
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.shut_down = channel_shutdown,
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.set_blocking = channel_set_blocking,
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.get_return_path = channel_get_input_return_path,
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};
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static const QEMUFileOps channel_output_ops = {
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.writev_buffer = channel_writev_buffer,
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.close = channel_close,
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.shut_down = channel_shutdown,
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.set_blocking = channel_set_blocking,
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.get_return_path = channel_get_output_return_path,
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};
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QEMUFile *qemu_fopen_channel_input(QIOChannel *ioc)
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{
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object_ref(OBJECT(ioc));
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return qemu_fopen_ops(ioc, &channel_input_ops);
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}
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QEMUFile *qemu_fopen_channel_output(QIOChannel *ioc)
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{
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object_ref(OBJECT(ioc));
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return qemu_fopen_ops(ioc, &channel_output_ops);
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}
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