xref: /openbmc/qemu/block/create.c (revision c09124dc)
1 /*
2  * Block layer code related to image creation
3  *
4  * Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 
25 #include "qemu/osdep.h"
26 #include "block/block_int.h"
27 #include "qemu/job.h"
28 #include "qemu/main-loop.h"
29 #include "qapi/qapi-commands-block-core.h"
30 #include "qapi/qapi-visit-block-core.h"
31 #include "qapi/clone-visitor.h"
32 #include "qapi/error.h"
33 
34 typedef struct BlockdevCreateJob {
35     Job common;
36     BlockDriver *drv;
37     BlockdevCreateOptions *opts;
38 } BlockdevCreateJob;
39 
40 static int coroutine_fn blockdev_create_run(Job *job, Error **errp)
41 {
42     BlockdevCreateJob *s = container_of(job, BlockdevCreateJob, common);
43     int ret;
44 
45     job_progress_set_remaining(&s->common, 1);
46     ret = s->drv->bdrv_co_create(s->opts, errp);
47     job_progress_update(&s->common, 1);
48 
49     qapi_free_BlockdevCreateOptions(s->opts);
50 
51     return ret;
52 }
53 
54 static const JobDriver blockdev_create_job_driver = {
55     .instance_size = sizeof(BlockdevCreateJob),
56     .job_type      = JOB_TYPE_CREATE,
57     .run           = blockdev_create_run,
58 };
59 
60 void qmp_blockdev_create(const char *job_id, BlockdevCreateOptions *options,
61                          Error **errp)
62 {
63     BlockdevCreateJob *s;
64     const char *fmt = BlockdevDriver_str(options->driver);
65     BlockDriver *drv = bdrv_find_format(fmt);
66 
67     if (!drv) {
68         error_setg(errp, "Block driver '%s' not found or not supported", fmt);
69         return;
70     }
71 
72     /* If the driver is in the schema, we know that it exists. But it may not
73      * be whitelisted. */
74     if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
75         error_setg(errp, "Driver is not whitelisted");
76         return;
77     }
78 
79     /* Error out if the driver doesn't support .bdrv_co_create */
80     if (!drv->bdrv_co_create) {
81         error_setg(errp, "Driver does not support blockdev-create");
82         return;
83     }
84 
85     /* Create the block job */
86     /* TODO Running in the main context. Block drivers need to error out or add
87      * locking when they use a BDS in a different AioContext. */
88     s = job_create(job_id, &blockdev_create_job_driver, NULL,
89                    qemu_get_aio_context(), JOB_DEFAULT | JOB_MANUAL_DISMISS,
90                    NULL, NULL, errp);
91     if (!s) {
92         return;
93     }
94 
95     s->drv = drv,
96     s->opts = QAPI_CLONE(BlockdevCreateOptions, options),
97 
98     job_start(&s->common);
99 }
100