b0292b851b
This adds a synchronous x-blockdev-create QMP command that can create qcow2 images on a given node name. We don't want to block while creating an image, so this is not the final interface in all aspects, but BlockdevCreateOptionsQcow2 and .bdrv_co_create() are what they actually might look like in the end. In any case, this should be good enough to test whether we interpret BlockdevCreateOptions as we should. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/*
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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 "qapi/qapi-commands-block-core.h"
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#include "qapi/error.h"
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typedef struct BlockdevCreateCo {
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BlockDriver *drv;
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BlockdevCreateOptions *opts;
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int ret;
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Error **errp;
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} BlockdevCreateCo;
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static void coroutine_fn bdrv_co_create_co_entry(void *opaque)
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{
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BlockdevCreateCo *cco = opaque;
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cco->ret = cco->drv->bdrv_co_create(cco->opts, cco->errp);
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}
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void qmp_x_blockdev_create(BlockdevCreateOptions *options, Error **errp)
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{
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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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Coroutine *co;
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BlockdevCreateCo cco;
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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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assert(drv);
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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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/* Call callback if it exists */
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if (!drv->bdrv_co_create) {
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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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cco = (BlockdevCreateCo) {
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.drv = drv,
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.opts = options,
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.ret = -EINPROGRESS,
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.errp = errp,
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};
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co = qemu_coroutine_create(bdrv_co_create_co_entry, &cco);
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qemu_coroutine_enter(co);
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while (cco.ret == -EINPROGRESS) {
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aio_poll(qemu_get_aio_context(), true);
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}
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}
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