[Unionfs] unionfs and sys_readahead and squashfs

[Paul Albrecht]

On Wed, 2007-11-07 at 15:02 +0000, Phillip Lougher wrote:
> On 11/6/07, Paul Albrecht <albrecht at rdi1.com> wrote:
> 
> >
> > Don't know if this helps, but I'm using ubuntu--7.04 or 7.10, doesn't
> > make any difference--and I noticed there's a comment in their initrd to
> > the effect that unionfs + squashfs don't play well together so they
> > disable readahead-list if they need to union mount a squashed
> > filesystem.
> >
> 
> Yes, it does make a difference.  The version of Unionfs used in Ubuntu
> 7.04 and 7.10 is Unionfs 1.4, which is extremely old.  As it is such
> an old version of Unionfs it is unlikely you'll get much interest in
> trying to fix any readahead-list issues with it.
> 
> Your best option is to update Unionfs in the kernel to the latest
> 2.1.8 version and try readahead-list with that.  You, however, don't
> mention how familiar you are with kernel patching or compiling.
> 

You're a member of the canonical kernel team, right? Any idea what the
plans are for incorporating the latest and greatest unionfs into their
kernel source?

Paul Albrecht