Comment 5 for bug 390423

Created attachment 294387
initial patch

Here's a patch to implement ext4dev, xfs, and fix a "raiserfs" typo.

Note: ext4dev will at some point change to "ext4" so some changes will need to
be made at that point.

A test for the fully ext4-capable version of e2fsprogs would probably also be
good.

I felt a little bad with all the cut and paste; perhaps ext2/3/4 could use some
class inheritance?

If you'd like a simpler test for get_label, you could just call e2label rather
than parsing out tune2fs output.

Thanks,

-Eric