qemu

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/*
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 * Block layer code related to image creation
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 *
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 * Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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 * THE SOFTWARE.
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 */
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#include "qemu/osdep.h"
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#include "block/block_int.h"
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#include "qemu/job.h"
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#include "qemu/main-loop.h"
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#include "qapi/qapi-commands-block-core.h"
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#include "qapi/qapi-visit-block-core.h"
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#include "qapi/clone-visitor.h"
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#include "qapi/error.h"
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typedef struct BlockdevCreateJob {
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    Job common;
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    BlockDriver *drv;
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    BlockdevCreateOptions *opts;
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} BlockdevCreateJob;
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static int coroutine_fn blockdev_create_run(Job *job, Error **errp)
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{
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    BlockdevCreateJob *s = container_of(job, BlockdevCreateJob, common);
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    int ret;
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    GLOBAL_STATE_CODE();
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    job_progress_set_remaining(&s->common, 1);
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    ret = s->drv->bdrv_co_create(s->opts, errp);
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    job_progress_update(&s->common, 1);
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    qapi_free_BlockdevCreateOptions(s->opts);
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    return ret;
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}
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static const JobDriver blockdev_create_job_driver = {
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    .instance_size = sizeof(BlockdevCreateJob),
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    .job_type      = JOB_TYPE_CREATE,
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    .run           = blockdev_create_run,
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};
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/* Checking whether the function is present doesn't require the graph lock */
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static inline bool TSA_NO_TSA has_bdrv_co_create(BlockDriver *drv)
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{
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    return drv->bdrv_co_create;
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}
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void qmp_blockdev_create(const char *job_id, BlockdevCreateOptions *options,
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                         Error **errp)
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{
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    BlockdevCreateJob *s;
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    const char *fmt = BlockdevDriver_str(options->driver);
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    BlockDriver *drv = bdrv_find_format(fmt);
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    if (!drv) {
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        error_setg(errp, "Block driver '%s' not found or not supported", fmt);
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        return;
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    }
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    /* If the driver is in the schema, we know that it exists. But it may not
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     * be whitelisted. */
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    if (bdrv_uses_whitelist() && !bdrv_is_whitelisted(drv, false)) {
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        error_setg(errp, "Driver is not whitelisted");
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        return;
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    }
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    /* Error out if the driver doesn't support .bdrv_co_create */
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    if (!has_bdrv_co_create(drv)) {
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        error_setg(errp, "Driver does not support blockdev-create");
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        return;
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    }
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    /* Create the block job */
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    /* TODO Running in the main context. Block drivers need to error out or add
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     * locking when they use a BDS in a different AioContext. */
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    s = job_create(job_id, &blockdev_create_job_driver, NULL,
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                   qemu_get_aio_context(), JOB_DEFAULT | JOB_MANUAL_DISMISS,
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                   NULL, NULL, errp);
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    if (!s) {
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        return;
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    }
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    s->drv = drv,
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    s->opts = QAPI_CLONE(BlockdevCreateOptions, options),
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    job_start(&s->common);
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}
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