kernfs_find_and_get_node_by_id
kn = kernfs_find_and_get_node_by_id(info->root, id);
struct kernfs_node *kernfs_find_and_get_node_by_id(struct kernfs_root *root,
kn = kernfs_find_and_get_node_by_id(cgrp_dfl_root.kf_root, id);
kn = kernfs_find_and_get_node_by_id(cgrp_dfl_root.kf_root, id);