path_node
struct radix_tree_node *n = path_node(t, &path, i - 1);
n = path_node(t, path, lastidx - 1);
const char *id_node, const char *path_node)
err = xenbus_read(NULL, xendev->xbusd_path, path_node,
path_node, xendev->xbusd_path, err);
path_node, xendev->xbusd_path);
xendev->xbusd_path, path_node, xendev->xbusd_otherend);