class Stats {

        public static Long readOperations(FsInfo.IoStats ioStats) {
            if (ioStats != null) {
                return ioStats.getTotalReadOperations();
            }
            return -1L;
        }

        public static Long bytesRead(FsInfo.IoStats ioStats) {<FILL_FUNCTION_BODY>}

        public static Long writeOperations(FsInfo.IoStats ioStats) {
            if (ioStats != null) {
                return ioStats.getTotalWriteOperations();
            }
            return -1L;
        }

        public static Long bytesWritten(FsInfo.IoStats ioStats) {
            if (ioStats != null) {
                return ioStats.getTotalWriteKilobytes() * 1024L;
            }
            return -1L;
        }
    }

            if (ioStats != null) {
                return ioStats.getTotalReadKilobytes() * 1024L;
            }
            return -1L;
        
<no_super_class>