qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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create.c (3432B)

      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 void qmp_blockdev_create(const char *job_id, BlockdevCreateOptions *options,
     63                          Error **errp)
     64 {
     65     BlockdevCreateJob *s;
     66     const char *fmt = BlockdevDriver_str(options->driver);
     67     BlockDriver *drv = bdrv_find_format(fmt);
     68 
     69     if (!drv) {
     70         error_setg(errp, "Block driver '%s' not found or not supported", fmt);
     71         return;
     72     }
     73 
     74     /* If the driver is in the schema, we know that it exists. But it may not
     75      * be whitelisted. */
     76     if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
     77         error_setg(errp, "Driver is not whitelisted");
     78         return;
     79     }
     80 
     81     /* Error out if the driver doesn't support .bdrv_co_create */
     82     if (!drv->bdrv_co_create) {
     83         error_setg(errp, "Driver does not support blockdev-create");
     84         return;
     85     }
     86 
     87     /* Create the block job */
     88     /* TODO Running in the main context. Block drivers need to error out or add
     89      * locking when they use a BDS in a different AioContext. */
     90     s = job_create(job_id, &blockdev_create_job_driver, NULL,
     91                    qemu_get_aio_context(), JOB_DEFAULT | JOB_MANUAL_DISMISS,
     92                    NULL, NULL, errp);
     93     if (!s) {
     94         return;
     95     }
     96 
     97     s->drv = drv,
     98     s->opts = QAPI_CLONE(BlockdevCreateOptions, options),
     99 
    100     job_start(&s->common);
    101 }