var d unsafe.Pointer
	if len(data) > 0 {
		d = unsafe.Pointer(&data[0])
	}
	datasiz := len(data)

	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return
	}

	_, err = ExtattrSetLink(link, nsid, a, uintptr(d), datasiz)
	return
}

func Removexattr(file string, attr string) (err error) {
	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return
	}