block: Introduce .bdrv_co_ioctl() driver callback
This allows drivers to implement ioctls in a coroutine-based way. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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This allows drivers to implement ioctls in a coroutine-based way. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>