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block: Add blk_make_empty()

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Two callers of BlockDriver.bdrv_make_empty() remain that should not call
this method directly.  Both do not have access to a BdrvChild, but they
can use a BlockBackend, so we add this function that lets them use it.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200429141126.85159-4-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2020-04-29 16:11:25 +02:00 committed by Kevin Wolf
parent 6f7a3b535f
commit 2b7bbdbdef
2 changed files with 12 additions and 0 deletions
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10
block/block-backend.c
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@ -2402,3 +2402,13 @@ const BdrvChild *blk_root(BlockBackend *blk)
{
return blk->root;
}
int blk_make_empty(BlockBackend *blk, Error **errp)
{
if (!blk_is_available(blk)) {
error_setg(errp, "No medium inserted");
return -ENOMEDIUM;
}
return bdrv_make_empty(blk->root, errp);
}

2
include/sysemu/block-backend.h
View file

@ -266,4 +266,6 @@ int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
const BdrvChild *blk_root(BlockBackend *blk);
int blk_make_empty(BlockBackend *blk, Error **errp);
#endif