1 /*
2 * Block layer code related to image options amend
3 *
4 * Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
5 * Copyright (c) 2020 Red Hat. Inc
6 *
7 * Heavily based on create.c
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to deal
11 * in the Software without restriction, including without limitation the rights
12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 * copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 * THE SOFTWARE.
26 */
27
28 #include "qemu/osdep.h"
29 #include "block/block-io.h"
30 #include "block/block_int.h"
31 #include "qemu/job.h"
32 #include "qemu/main-loop.h"
33 #include "qapi/qapi-commands-block-core.h"
34 #include "qapi/qapi-visit-block-core.h"
35 #include "qapi/clone-visitor.h"
36 #include "qapi/error.h"
37
38 typedef struct BlockdevAmendJob {
39 Job common;
40 BlockdevAmendOptions *opts;
41 BlockDriverState *bs;
42 bool force;
43 } BlockdevAmendJob;
44
blockdev_amend_run(Job * job,Error ** errp)45 static int coroutine_fn blockdev_amend_run(Job *job, Error **errp)
46 {
47 BlockdevAmendJob *s = container_of(job, BlockdevAmendJob, common);
48 int ret;
49 GRAPH_RDLOCK_GUARD();
50
51 job_progress_set_remaining(&s->common, 1);
52 ret = s->bs->drv->bdrv_co_amend(s->bs, s->opts, s->force, errp);
53 job_progress_update(&s->common, 1);
54 qapi_free_BlockdevAmendOptions(s->opts);
55 return ret;
56 }
57
58 static int GRAPH_RDLOCK
blockdev_amend_pre_run(BlockdevAmendJob * s,Error ** errp)59 blockdev_amend_pre_run(BlockdevAmendJob *s, Error **errp)
60 {
61 if (s->bs->drv->bdrv_amend_pre_run) {
62 return s->bs->drv->bdrv_amend_pre_run(s->bs, errp);
63 }
64
65 return 0;
66 }
67
blockdev_amend_free(Job * job)68 static void blockdev_amend_free(Job *job)
69 {
70 BlockdevAmendJob *s = container_of(job, BlockdevAmendJob, common);
71
72 bdrv_graph_rdlock_main_loop();
73 if (s->bs->drv->bdrv_amend_clean) {
74 s->bs->drv->bdrv_amend_clean(s->bs);
75 }
76 bdrv_graph_rdunlock_main_loop();
77
78 bdrv_unref(s->bs);
79 }
80
81 static const JobDriver blockdev_amend_job_driver = {
82 .instance_size = sizeof(BlockdevAmendJob),
83 .job_type = JOB_TYPE_AMEND,
84 .run = blockdev_amend_run,
85 .free = blockdev_amend_free,
86 };
87
qmp_x_blockdev_amend(const char * job_id,const char * node_name,BlockdevAmendOptions * options,bool has_force,bool force,Error ** errp)88 void qmp_x_blockdev_amend(const char *job_id,
89 const char *node_name,
90 BlockdevAmendOptions *options,
91 bool has_force,
92 bool force,
93 Error **errp)
94 {
95 BlockdevAmendJob *s;
96 const char *fmt = BlockdevDriver_str(options->driver);
97 BlockDriver *drv = bdrv_find_format(fmt);
98 BlockDriverState *bs;
99
100 GRAPH_RDLOCK_GUARD_MAINLOOP();
101
102 bs = bdrv_lookup_bs(NULL, node_name, errp);
103 if (!bs) {
104 return;
105 }
106
107 if (!drv) {
108 error_setg(errp, "Block driver '%s' not found or not supported", fmt);
109 return;
110 }
111
112 /*
113 * If the driver is in the schema, we know that it exists. But it may not
114 * be whitelisted.
115 */
116 if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
117 error_setg(errp, "Driver is not whitelisted");
118 return;
119 }
120
121 if (bs->drv != drv) {
122 error_setg(errp,
123 "x-blockdev-amend doesn't support changing the block driver");
124 return;
125 }
126
127 /* Error out if the driver doesn't support .bdrv_co_amend */
128 if (!drv->bdrv_co_amend) {
129 error_setg(errp, "Driver does not support x-blockdev-amend");
130 return;
131 }
132
133 /* Create the block job */
134 s = job_create(job_id, &blockdev_amend_job_driver, NULL,
135 bdrv_get_aio_context(bs), JOB_DEFAULT | JOB_MANUAL_DISMISS,
136 NULL, NULL, errp);
137 if (!s) {
138 return;
139 }
140
141 bdrv_ref(bs);
142 s->bs = bs,
143 s->opts = QAPI_CLONE(BlockdevAmendOptions, options),
144 s->force = has_force ? force : false;
145
146 if (blockdev_amend_pre_run(s, errp)) {
147 job_early_fail(&s->common);
148 return;
149 }
150
151 job_start(&s->common);
152 }
153