From: Peter Staubach <staubach@redhat.com>
Subject: Re: [PATCH] NFS: implement option checking when remounting NFS
	filesystems
Date: Fri, 11 Apr 2008 15:19:15 -0400
Message-ID: <47FFB9B3.1020703@redhat.com>
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To: Jeff Layton <jlayton@redhat.com>
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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?

       ps