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 } 108