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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 | 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 */ | |
63 | static inline bool TSA_NO_TSA has_bdrv_co_create(BlockDriver *drv) | |
64 | { | |
65 | return drv->bdrv_co_create; | |
66 | } | |
67 | ||
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 | } |