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65cf200a DB |
1 | /* |
2 | * QEMU I/O channels block driver | |
3 | * | |
4 | * Copyright (c) 2022 Red Hat, Inc. | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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/>. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include "qemu/osdep.h" | |
22 | #include "migration/channel-block.h" | |
23 | #include "qapi/error.h" | |
24 | #include "block/block.h" | |
25 | #include "trace.h" | |
26 | ||
27 | QIOChannelBlock * | |
28 | qio_channel_block_new(BlockDriverState *bs) | |
29 | { | |
30 | QIOChannelBlock *ioc; | |
31 | ||
32 | ioc = QIO_CHANNEL_BLOCK(object_new(TYPE_QIO_CHANNEL_BLOCK)); | |
33 | ||
34 | bdrv_ref(bs); | |
35 | ioc->bs = bs; | |
36 | ||
37 | return ioc; | |
38 | } | |
39 | ||
40 | ||
41 | static void | |
42 | qio_channel_block_finalize(Object *obj) | |
43 | { | |
44 | QIOChannelBlock *ioc = QIO_CHANNEL_BLOCK(obj); | |
45 | ||
46 | g_clear_pointer(&ioc->bs, bdrv_unref); | |
47 | } | |
48 | ||
49 | ||
50 | static ssize_t | |
51 | qio_channel_block_readv(QIOChannel *ioc, | |
52 | const struct iovec *iov, | |
53 | size_t niov, | |
54 | int **fds, | |
55 | size_t *nfds, | |
84615a19 | 56 | int flags, |
65cf200a DB |
57 | Error **errp) |
58 | { | |
59 | QIOChannelBlock *bioc = QIO_CHANNEL_BLOCK(ioc); | |
60 | QEMUIOVector qiov; | |
61 | int ret; | |
62 | ||
63 | qemu_iovec_init_external(&qiov, (struct iovec *)iov, niov); | |
64 | ret = bdrv_readv_vmstate(bioc->bs, &qiov, bioc->offset); | |
65 | if (ret < 0) { | |
a216ec85 FE |
66 | error_setg_errno(errp, -ret, "bdrv_readv_vmstate failed"); |
67 | return -1; | |
65cf200a DB |
68 | } |
69 | ||
70 | bioc->offset += qiov.size; | |
71 | return qiov.size; | |
72 | } | |
73 | ||
74 | ||
75 | static ssize_t | |
76 | qio_channel_block_writev(QIOChannel *ioc, | |
77 | const struct iovec *iov, | |
78 | size_t niov, | |
79 | int *fds, | |
80 | size_t nfds, | |
81 | int flags, | |
82 | Error **errp) | |
83 | { | |
84 | QIOChannelBlock *bioc = QIO_CHANNEL_BLOCK(ioc); | |
85 | QEMUIOVector qiov; | |
86 | int ret; | |
87 | ||
88 | qemu_iovec_init_external(&qiov, (struct iovec *)iov, niov); | |
89 | ret = bdrv_writev_vmstate(bioc->bs, &qiov, bioc->offset); | |
90 | if (ret < 0) { | |
a216ec85 FE |
91 | error_setg_errno(errp, -ret, "bdrv_writev_vmstate failed"); |
92 | return -1; | |
65cf200a DB |
93 | } |
94 | ||
95 | bioc->offset += qiov.size; | |
96 | return qiov.size; | |
97 | } | |
98 | ||
99 | ||
100 | static int | |
101 | qio_channel_block_set_blocking(QIOChannel *ioc, | |
102 | bool enabled, | |
103 | Error **errp) | |
104 | { | |
105 | if (!enabled) { | |
106 | error_setg(errp, "Non-blocking mode not supported for block devices"); | |
107 | return -1; | |
108 | } | |
109 | return 0; | |
110 | } | |
111 | ||
112 | ||
113 | static off_t | |
114 | qio_channel_block_seek(QIOChannel *ioc, | |
115 | off_t offset, | |
116 | int whence, | |
117 | Error **errp) | |
118 | { | |
119 | QIOChannelBlock *bioc = QIO_CHANNEL_BLOCK(ioc); | |
120 | ||
121 | switch (whence) { | |
122 | case SEEK_SET: | |
123 | bioc->offset = offset; | |
124 | break; | |
125 | case SEEK_CUR: | |
126 | bioc->offset += whence; | |
127 | break; | |
128 | case SEEK_END: | |
129 | error_setg(errp, "Size of VMstate region is unknown"); | |
130 | return (off_t)-1; | |
131 | default: | |
132 | g_assert_not_reached(); | |
133 | } | |
134 | ||
135 | return bioc->offset; | |
136 | } | |
137 | ||
138 | ||
139 | static int | |
140 | qio_channel_block_close(QIOChannel *ioc, | |
141 | Error **errp) | |
142 | { | |
143 | QIOChannelBlock *bioc = QIO_CHANNEL_BLOCK(ioc); | |
144 | int rv = bdrv_flush(bioc->bs); | |
145 | ||
146 | if (rv < 0) { | |
147 | error_setg_errno(errp, -rv, | |
148 | "Unable to flush VMState"); | |
149 | return -1; | |
150 | } | |
151 | ||
152 | g_clear_pointer(&bioc->bs, bdrv_unref); | |
153 | bioc->offset = 0; | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | ||
159 | static void | |
160 | qio_channel_block_set_aio_fd_handler(QIOChannel *ioc, | |
06e0f098 | 161 | AioContext *read_ctx, |
65cf200a | 162 | IOHandler *io_read, |
06e0f098 | 163 | AioContext *write_ctx, |
65cf200a DB |
164 | IOHandler *io_write, |
165 | void *opaque) | |
166 | { | |
167 | /* XXX anything we can do here ? */ | |
168 | } | |
169 | ||
170 | ||
171 | static void | |
172 | qio_channel_block_class_init(ObjectClass *klass, | |
173 | void *class_data G_GNUC_UNUSED) | |
174 | { | |
175 | QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); | |
176 | ||
177 | ioc_klass->io_writev = qio_channel_block_writev; | |
178 | ioc_klass->io_readv = qio_channel_block_readv; | |
179 | ioc_klass->io_set_blocking = qio_channel_block_set_blocking; | |
180 | ioc_klass->io_seek = qio_channel_block_seek; | |
181 | ioc_klass->io_close = qio_channel_block_close; | |
182 | ioc_klass->io_set_aio_fd_handler = qio_channel_block_set_aio_fd_handler; | |
183 | } | |
184 | ||
185 | static const TypeInfo qio_channel_block_info = { | |
186 | .parent = TYPE_QIO_CHANNEL, | |
187 | .name = TYPE_QIO_CHANNEL_BLOCK, | |
188 | .instance_size = sizeof(QIOChannelBlock), | |
189 | .instance_finalize = qio_channel_block_finalize, | |
190 | .class_init = qio_channel_block_class_init, | |
191 | }; | |
192 | ||
193 | static void | |
194 | qio_channel_block_register_types(void) | |
195 | { | |
196 | type_register_static(&qio_channel_block_info); | |
197 | } | |
198 | ||
199 | type_init(qio_channel_block_register_types); |