ovl_do_link
err = ovl_do_link(ofs, ovl_dentry_upper(c->dentry), udir, upper);
err = ovl_do_link(ofs, temp, udir, upper);
err = ovl_do_link(ofs, ofs->whiteout, wdir, link);
err = ovl_do_link(ofs, attr->hardlink, dir, newdentry);