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To try the kernel module execute the following steps:

  1. Open a terminal
  2. git clone https://github.com/BjoernDaase/vfs-FATx.git
  3. cd module
  4. make (if there are any libraries missing, try installing linux kernel headers, e.g. on Debian: apt-get install linux-headers-$(uname -r) ).
  5. sudo insmod FATx-vfs.ko (this will load the LKM)
  6. Information about the module can be seen by taping modinfo FATx-vfs.ko
  7. If step 4 was executed correctly you should see a FATx_vfs entry when typing lsmod
  8. Now we can remoce the LKM again using sudo rmmod FATx_vfs.ko
  9. If all the steps before were executed corretly using sudo tail -f /var/log/kern.log (or if you do not sse anything cat /var/log/kern.log | grep LKM) should see entries like (timestamps and metainfo could differ)

Jun 1 09:02:07 bjoerns-HP kernel: [13446.920585] Hello from the FATxvfs LKM!
Jun 1 09:02:17 bjoerns-HP kernel: [13457.138484] Goodbye from the FATxvfs LKM!

To mount an image into an directory do the following (DO NOT DO THIS ON YOUR WORKING COMPUTER)

  1. Insert the module as shown above first
  2. Run sudo mount -o loop -t fatx ./image ./dir. This will fail (and is inteded to do so), you will recieve an output like Killed
  3. Now have a look at the kernel messages and run dmesg, you will see a lot of errors (beacuse the mount fails). But especially you will see a [ 455.049283] fatx mounted , which means that the mountng was 'successfull'
  4. Unounting via sudo umount ./dir won't work, beacuse the directory is not mounted
  5. You WILL NOT BE ABLE TO EASILY UNMOUNT THE MODULE with sudo rmmod FATx_vfs.ko, becuse it's in use now (see lsmod)
  6. Restart and everything is fine again