The NFS "nosharecache" patch in F7 is broken

[Trond Myklebust]

On Tue, 2007-08-21 at 12:14 -0400, Steve Dickson wrote:
> 
> Dave Jones wrote:
> > On Tue, Aug 21, 2007 at 10:29:53AM -0400, Chuck Ebbert wrote:
> >  > If people try mounting several exports from the same filesystem, it fails
> >  > with confusing error messages if the mount options are different for some
> >  > of the mount points. Adding "nosharecache" to the mount options fixes that,
> >  > but people with working setups suddenly find they need this new option to
> >  > use a setup that used to work without it. Should we just revert that patch?
> Thats been the million dollar question lately... there has been quite a
> bit of complaints about this patch... but note the check does do some
> correct sanity checking so the changes it point would be a good
> thing to do....
> 
> But with that said, I would if making it a warning first, giving
> people time to clean up their setups and then making it an
> error later on...
> 
> steved.

It is important that people know about the consequences of using
nosharecache: namely that they may see cache corruption when accessing
the same file via different mountpoints. That is why I firmly believe it
should _NOT_ be a default.

Trond