> > How many file systems really supported the old suspension method other 
> > than ffs? Or is this coexistance more of a smoothing of switching to the 
> > new method for ffs?
> > 
> > i.e. do we need this?
> 
> All file systems on a block device support file system external snapshots.  

does anyone seriously care?
i don't think it's worth to keep it, given its great complexity and
incompleteness.

YAMAMOTO Takashi