[PATCH] NFS: implement option checking when remounting NFS filesystems

[Trond Myklebust]

On Fri, 2008-04-11 at 15:19 -0400, Peter Staubach wrote:
> Jeff Layton wrote:
> > When remounting an NFS or NFS4 filesystem, the new NFS options are not
> > respected, yet the remount will still return success. This patch adds
> > a remount_fs sb op for NFS that checks any new nfs mount options against
> > the existing ones and fails the mount if any have changed.
> >
> > This is only implemented for string-based mount options since doing
> > this with binary options isn't really feasible.
> 
> What about respecting the new options as makes sense and rejecting
> those which absolutely can't be changed dynamically?

If we were to do this, then how should superblocks that are shared
between multiple mountpoints behave?

Cheers
  Trond