Enhancement: offer the value of getUsableSpace()

[rwalkerands]

The data for the "Free disk space" graph is based on the value of getFreeSpace(). (See JavaInformations.java.) At least on Linux/Unix this value includes both the free space for block usage and for inodes. In practice, you will almost certainly run out of block usage first, and have a lot of inode space left over that you can't use.

For example, javamelody is currently telling me that I have 22 G of disk space free. But the output of df tells me that I only have 15 G free; the other 7 G is certainly "free", but it is allocated for inodes.

The getUsableSpace() method does return 15 G in my case. Test program:

import java.io.File;

public class freespace {

    public static void main(String[] args) {
	File file = new File(".");
	System.out.println("getFreeSpace: " + file.getFreeSpace());
	System.out.println("getUsableSpace: " + file.getUsableSpace());
    }

}

Output:

getFreeSpace: 22095831040
getUsableSpace: 15895654400

So, would it be possible to have the value of getUsableSpace() recorded and graphed, either as well as, or instead of, getFreeSpace()?

[evernat]

Done by 6eb6c99 and ready for the next release (1.81).
A snapshot build is available at:
http://javamelody.org/downloads/javamelody-core-1.81.0-SNAPSHOT.jar

[rwalkerands]

Works for me, thank you!