Update cmpefs_kernelmod.c

Make/install the kernel module as usual:
make all
./install.sh

Next, create a new directory for the file system to be mounted in. For example, I'm using /STUFF/:
mkdir /STUFF/

Now mount the filesystem:
mount -t cmpefs /dev/foo /STUFF/

This file system creates two files upon mount: testfile and testfile1. Check by:
ls /STUFF/

You should see both files in here. This is as far as I've gotten.