You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: disk_linux.go
    path of file: ./repos/go-ethereum/metrics
    
    the code of the file until where you have to start completion: // Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be
    
func ReadDiskStats(stats *DiskStats) error {
	// Open the process disk IO counter file
	inf, err := os.Open(fmt.Sprintf("/proc/%d/io", os.Getpid()))
	if err != nil {
		return err
	}
	defer inf.Close()
	in := bufio.NewReader(inf)

	// Iterate over the IO counter, and extract what we need
	for {
		// Read the next line and split to key and value
		line, err := in.ReadString('\n')
		if err != nil {
			if err == io.EOF {
				return nil
			}
			return err
		}
		parts := strings.Split(line, ":")
		if len(parts) != 2 {
			continue
		}
		key := strings.TrimSpace(parts[0])
		value, err := strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 64)
		if err != nil {
			return err
		}

		// Update the counter based on the key
		switch key {
		case "syscr":
			stats.ReadCount = value
		case "syscw":
			stats.WriteCount = value
		case "rchar":
			stats.ReadBytes = value
		case "wchar":
			stats.WriteBytes = value
		}
	}
}