| 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 | } |