>> You should be able to use MFS without FFS; MFS should pull in the
>> necessary FFS bits on its own.  If it doesn't, I'd call that a bug.

>And just how would you suggest this be done?
>
>If I link in the ffs system automatically, that's ok.  If the mfs
>LKM contains the ffs code internally, then you're screwed when you try
>to load both mfs and ffs due to duplicate symbols.

Compile both the ffs  and mfs LKMs to refer to a third lkm containing
shared ffs subroutines.  Load those subrourites before loading either
the ffs  or mfs  LKMs.