get_ns_common_ref
parent = get_ns_common_ref(dir->i_private);
parent = get_ns_common_ref(dir->i_private);
struct aa_ns *ns = get_ns_common_ref(f->f_inode->i_private);
struct aa_ns *ns = get_ns_common_ref(f->f_inode->i_private);
struct aa_ns *ns = get_ns_common_ref(f->f_inode->i_private);
rev->ns = get_ns_common_ref(inode->i_private);