> +impl BdrvChild {
> + /// Creates a new child reference from a `BlockdevRef`.
> + pub unsafe fn new(
> + parent: *mut bindings::BlockDriverState,
> + bref: *mut bindings::BlockdevRef,
> + errp: *mut *mut bindings::Error,
> + ) -> Option<Self> {
> + unsafe {
> + let child_bs = bindings::bdrv_open_blockdev_ref_file(bref,
> parent, errp);
> + if child_bs.is_null() {
> + return None;
> + }
> +
> + bindings::bdrv_graph_wrlock();
> + let child = bindings::bdrv_attach_child(
> + parent,
> + child_bs,
> + c"file".as_ptr(),
c literal starts from v1.77, and there's a workaround provided by
c_str.rs:
c_str!("file").as_ptr()
> + &bindings::child_of_bds as *const _,
> + bindings::BDRV_CHILD_IMAGE,
> + errp,
> + );
> + bindings::bdrv_graph_wrunlock();
> +
> + if child.is_null() {
> + None
> + } else {
> + Some(BdrvChild { child })
> + }
> + }
> + }
> +
