[Linux-cachefs] FS-Cache for NFS-root ?

[Wilhelm Meier]

Am Freitag, 19. Januar 2007 02:01 schrieb Eli Stair:
> I actually refrain from running 'cachefilesd' until the system is
> running in the NFS root filesystem, and start it at the end of a
> runlevel.  I don't know that you can work around the issue you're having
> short of launching it that way, or stopping the daemon while in your
> initramfs but before doing your switch_root().  You may be able to work
> around it if you /really/ want to cache those files during boot (I
> understand), if you ditch your bind mount and to a --move instead.
> After all, you don't want the filesystem available in two places, just
> in a /new/ one.
>
> In fact, I'm not entirely sure that move trick will work with the
> running daemon, but let us know?

Well, now I split the task in two halfs:

i) initramfs: mounting the nfsroot(fsc), perhaps initialising the cache, 
switch_root

ii) mounting the cache-filesystem, starting cachefilesd, aufs-mounting stuff, 
exec /sbin/init

That seems to be the clearest way.

>
>
> /eli
>
> Wilhelm Meier wrote:
> > The cache is originally mounted on /fscache in the initramfs, then the
> > nfsroot
> > is mounted and after that the cache is bind-mounted to /local/fscache on
> > the nfsroot. After that the switch_root happens.
> >
> > Additionally I create a mount-point /fscache in the nfsroot. Then df
> > shows also /fscache (and not the "/fscache not found" anymore), but with
> > wrong numbers, since it is an empty mountpoint on nfsroot.
> >
> > Do you have a solution for that. Would you mind share your initramfs
> > with me?
> >
> > Filesystem           1K-blocks      Used Available Use% Mounted on
> > 192.168.39.10:/tftproot/gentoo_A
> >                        8256608   5785600   2471008  71% /
> > /dev/hda1              8256608   5785600   2471008  71% /fscache
> > /dev/hda1               473084    184006    264652  42% /local/fscache
> > udev                     30876       156     30720   1% /dev
> > shm                      30876         0     30876   0% /dev/shm
> >
> >  > /eli
> >  >
> >  > --
> >  > Linux-cachefs mailing list
> >  > Linux-cachefs at redhat.com
> >  > https://www.redhat.com/mailman/listinfo/linux-cachefs
> >
> > --
> > Wilhelm Meier

-- 
Wilhelm Meier
email: wilhelm.meier at fh-kl.de