xref: /openbmc/qemu/block/create.c (revision 4db7ba3b)
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 
blockdev_create_run(Job * job,Error ** errp)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     GLOBAL_STATE_CODE();
46 
47     job_progress_set_remaining(&s->common, 1);
48     ret = s->drv->bdrv_co_create(s->opts, errp);
49     job_progress_update(&s->common, 1);
50 
51     qapi_free_BlockdevCreateOptions(s->opts);
52 
53     return ret;
54 }
55 
56 static const JobDriver blockdev_create_job_driver = {
57     .instance_size = sizeof(BlockdevCreateJob),
58     .job_type      = JOB_TYPE_CREATE,
59     .run           = blockdev_create_run,
60 };
61 
62 /* Checking whether the function is present doesn't require the graph lock */
has_bdrv_co_create(BlockDriver * drv)63 static inline bool TSA_NO_TSA has_bdrv_co_create(BlockDriver *drv)
64 {
65     return drv->bdrv_co_create;
66 }
67 
qmp_blockdev_create(const char * job_id,BlockdevCreateOptions * options,Error ** errp)68 void qmp_blockdev_create(const char *job_id, BlockdevCreateOptions *options,
69                          Error **errp)
70 {
71     BlockdevCreateJob *s;
72     const char *fmt = BlockdevDriver_str(options->driver);
73     BlockDriver *drv = bdrv_find_format(fmt);
74 
75     if (!drv) {
76         error_setg(errp, "Block driver '%s' not found or not supported", fmt);
77         return;
78     }
79 
80     /* If the driver is in the schema, we know that it exists. But it may not
81      * be whitelisted. */
82     if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
83         error_setg(errp, "Driver is not whitelisted");
84         return;
85     }
86 
87     /* Error out if the driver doesn't support .bdrv_co_create */
88     if (!has_bdrv_co_create(drv)) {
89         error_setg(errp, "Driver does not support blockdev-create");
90         return;
91     }
92 
93     /* Create the block job */
94     /* TODO Running in the main context. Block drivers need to error out or add
95      * locking when they use a BDS in a different AioContext. */
96     s = job_create(job_id, &blockdev_create_job_driver, NULL,
97                    qemu_get_aio_context(), JOB_DEFAULT | JOB_MANUAL_DISMISS,
98                    NULL, NULL, errp);
99     if (!s) {
100         return;
101     }
102 
103     s->drv = drv,
104     s->opts = QAPI_CLONE(BlockdevCreateOptions, options),
105 
106     job_start(&s->common);
107 }
108