Automatic fsck

[Bram Neijt]

Although this might start a small side-track of the main subject, I
would like to add that it would be cool if the new solution could also
incorporate checking of usb mass storage devices. Portable hard disks
are becoming more popular, formatting them with ext is becoming more
popular, but there doesn't seem to be a good plan to check them.

I hope the eventual solution will also be applicable to portable storage
devices.

Bram