diff options
Diffstat (limited to 'migration/qemu-file-channel.c')
| -rw-r--r-- | migration/qemu-file-channel.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/migration/qemu-file-channel.c b/migration/qemu-file-channel.c new file mode 100644 index 0000000000..45c13f1028 --- /dev/null +++ b/migration/qemu-file-channel.c @@ -0,0 +1,180 @@ +/* + * QEMUFile backend for QIOChannel objects + * + * Copyright (c) 2015-2016 Red Hat, Inc + * + * 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/osdep.h" +#include "migration/qemu-file.h" +#include "io/channel-socket.h" +#include "qemu/iov.h" + + +static ssize_t channel_writev_buffer(void *opaque, + struct iovec *iov, + int iovcnt, + int64_t pos) +{ + QIOChannel *ioc = QIO_CHANNEL(opaque); + ssize_t done = 0; + struct iovec *local_iov = g_new(struct iovec, iovcnt); + struct iovec *local_iov_head = local_iov; + unsigned int nlocal_iov = iovcnt; + + nlocal_iov = iov_copy(local_iov, nlocal_iov, + iov, iovcnt, + 0, iov_size(iov, iovcnt)); + + while (nlocal_iov > 0) { + ssize_t len; + len = qio_channel_writev(ioc, local_iov, nlocal_iov, NULL); + if (len == QIO_CHANNEL_ERR_BLOCK) { + qio_channel_wait(ioc, G_IO_OUT); + continue; + } + if (len < 0) { + /* XXX handle Error objects */ + done = -EIO; + goto cleanup; + } + + iov_discard_front(&local_iov, &nlocal_iov, len); + done += len; + } + + cleanup: + g_free(local_iov_head); + return done; +} + + +static ssize_t channel_get_buffer(void *opaque, + uint8_t *buf, + int64_t pos, + size_t size) +{ + QIOChannel *ioc = QIO_CHANNEL(opaque); + ssize_t ret; + + do { + ret = qio_channel_read(ioc, (char *)buf, size, NULL); + if (ret < 0) { + if (ret == QIO_CHANNEL_ERR_BLOCK) { + qio_channel_yield(ioc, G_IO_IN); + } else { + /* XXX handle Error * object */ + return -EIO; + } + } + } while (ret == QIO_CHANNEL_ERR_BLOCK); + + return ret; +} + + +static int channel_close(void *opaque) +{ + QIOChannel *ioc = QIO_CHANNEL(opaque); + qio_channel_close(ioc, NULL); + object_unref(OBJECT(ioc)); + return 0; +} + + +static int channel_shutdown(void *opaque, + bool rd, + bool wr) +{ + QIOChannel *ioc = QIO_CHANNEL(opaque); + + if (qio_channel_has_feature(ioc, + QIO_CHANNEL_FEATURE_SHUTDOWN)) { + QIOChannelShutdown mode; + if (rd && wr) { + mode = QIO_CHANNEL_SHUTDOWN_BOTH; + } else if (rd) { + mode = QIO_CHANNEL_SHUTDOWN_READ; + } else { + mode = QIO_CHANNEL_SHUTDOWN_WRITE; + } + if (qio_channel_shutdown(ioc, mode, NULL) < 0) { + /* XXX handler Error * object */ + return -EIO; + } + } + return 0; +} + + +static int channel_set_blocking(void *opaque, + bool enabled) +{ + QIOChannel *ioc = QIO_CHANNEL(opaque); + + if (qio_channel_set_blocking(ioc, enabled, NULL) < 0) { + return -1; + } + return 0; +} + +static QEMUFile *channel_get_input_return_path(void *opaque) +{ + QIOChannel *ioc = QIO_CHANNEL(opaque); + + return qemu_fopen_channel_output(ioc); +} + +static QEMUFile *channel_get_output_return_path(void *opaque) +{ + QIOChannel *ioc = QIO_CHANNEL(opaque); + + return qemu_fopen_channel_input(ioc); +} + +static const QEMUFileOps channel_input_ops = { + .get_buffer = channel_get_buffer, + .close = channel_close, + .shut_down = channel_shutdown, + .set_blocking = channel_set_blocking, + .get_return_path = channel_get_input_return_path, +}; + + +static const QEMUFileOps channel_output_ops = { + .writev_buffer = channel_writev_buffer, + .close = channel_close, + .shut_down = channel_shutdown, + .set_blocking = channel_set_blocking, + .get_return_path = channel_get_output_return_path, +}; + + +QEMUFile *qemu_fopen_channel_input(QIOChannel *ioc) +{ + object_ref(OBJECT(ioc)); + return qemu_fopen_ops(ioc, &channel_input_ops); +} + +QEMUFile *qemu_fopen_channel_output(QIOChannel *ioc) +{ + object_ref(OBJECT(ioc)); + return qemu_fopen_ops(ioc, &channel_output_ops); +} |