2 * QEMU I/O channels block driver
4 * Copyright (c) 2022 Red Hat, Inc.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
21 #include "qemu/osdep.h"
22 #include "migration/channel-block.h"
23 #include "qapi/error.h"
24 #include "block/block.h"
28 qio_channel_block_new(BlockDriverState *bs)
32 ioc = QIO_CHANNEL_BLOCK(object_new(TYPE_QIO_CHANNEL_BLOCK));
42 qio_channel_block_finalize(Object *obj)
44 QIOChannelBlock *ioc = QIO_CHANNEL_BLOCK(obj);
46 g_clear_pointer(&ioc->bs, bdrv_unref);
51 qio_channel_block_readv(QIOChannel *ioc,
52 const struct iovec *iov,
58 QIOChannelBlock *bioc = QIO_CHANNEL_BLOCK(ioc);
62 qemu_iovec_init_external(&qiov, (struct iovec *)iov, niov);
63 ret = bdrv_readv_vmstate(bioc->bs, &qiov, bioc->offset);
65 error_setg_errno(errp, -ret, "bdrv_readv_vmstate failed");
69 bioc->offset += qiov.size;
75 qio_channel_block_writev(QIOChannel *ioc,
76 const struct iovec *iov,
83 QIOChannelBlock *bioc = QIO_CHANNEL_BLOCK(ioc);
87 qemu_iovec_init_external(&qiov, (struct iovec *)iov, niov);
88 ret = bdrv_writev_vmstate(bioc->bs, &qiov, bioc->offset);
90 error_setg_errno(errp, -ret, "bdrv_writev_vmstate failed");
94 bioc->offset += qiov.size;
100 qio_channel_block_set_blocking(QIOChannel *ioc,
105 error_setg(errp, "Non-blocking mode not supported for block devices");
113 qio_channel_block_seek(QIOChannel *ioc,
118 QIOChannelBlock *bioc = QIO_CHANNEL_BLOCK(ioc);
122 bioc->offset = offset;
125 bioc->offset += whence;
128 error_setg(errp, "Size of VMstate region is unknown");
131 g_assert_not_reached();
139 qio_channel_block_close(QIOChannel *ioc,
142 QIOChannelBlock *bioc = QIO_CHANNEL_BLOCK(ioc);
143 int rv = bdrv_flush(bioc->bs);
146 error_setg_errno(errp, -rv,
147 "Unable to flush VMState");
151 g_clear_pointer(&bioc->bs, bdrv_unref);
159 qio_channel_block_set_aio_fd_handler(QIOChannel *ioc,
165 /* XXX anything we can do here ? */
170 qio_channel_block_class_init(ObjectClass *klass,
171 void *class_data G_GNUC_UNUSED)
173 QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
175 ioc_klass->io_writev = qio_channel_block_writev;
176 ioc_klass->io_readv = qio_channel_block_readv;
177 ioc_klass->io_set_blocking = qio_channel_block_set_blocking;
178 ioc_klass->io_seek = qio_channel_block_seek;
179 ioc_klass->io_close = qio_channel_block_close;
180 ioc_klass->io_set_aio_fd_handler = qio_channel_block_set_aio_fd_handler;
183 static const TypeInfo qio_channel_block_info = {
184 .parent = TYPE_QIO_CHANNEL,
185 .name = TYPE_QIO_CHANNEL_BLOCK,
186 .instance_size = sizeof(QIOChannelBlock),
187 .instance_finalize = qio_channel_block_finalize,
188 .class_init = qio_channel_block_class_init,
192 qio_channel_block_register_types(void)
194 type_register_static(&qio_channel_block_info);
197 type_init(qio_channel_block_register_types);