From: Chuck Lever <chuck.lever@oracle.com>
Subject: Re: [PATCH] NFS: implement option checking when remounting NFS
	filesystems
Date: Fri, 11 Apr 2008 15:01:33 -0400
Message-ID: <47FFB58D.6080902@oracle.com>
References: <1207937413-16189-1-git-send-email-jlayton@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.

It might be feasible if mount.nfs were smart enough to read /etc/mtab 
and merge the old mount options with the remount options.

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