From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [patch] add dentry revalidate to follow mount.
Date: Mon, 8 Jun 2009 15:13:17 +0100
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Cc: linux-fsdevel@vger.kernel.org
To: pravin shelar <Pravin.Shelar@Sun.COM>
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On Mon, Jun 08, 2009 at 07:14:15PM +0530, pravin shelar wrote:
> Hi
>          i have seen error in lustre while setting permission on fs root
> from a client. problem is permission are not getting propagated to
> other clients.
>
> this is because of do_lookup() call path which does not revalidate
> fs root dentry in follow_mount()
>
> attached patch adds revalidation call in follow_mount.

... and makes umount() of such thing impossible.  NAK.  That's not a solution.