From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shaya Potter <spotter@cs.columbia.edu>
Subject: d_path and stackable filesystems
Date: 29 Jul 2003 00:02:25 -0400
Sender: linux-fsdevel-owner@vger.kernel.org
Message-ID: <1059451345.911.29.camel@zaphod>
Mime-Version: 1.0
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Return-path: <linux-fsdevel-owner@vger.kernel.org>
Received: from opus.cs.columbia.edu ([128.59.20.100]:32176 "EHLO
	opus.cs.columbia.edu") by vger.kernel.org with ESMTP
	id S271106AbTG2ECn (ORCPT <rfc822;linux-fsdevel@vger.kernel.org>);
	Tue, 29 Jul 2003 00:02:43 -0400
Received: from [192.168.0.103] (user-0cces8t.cable.mindspring.com [24.199.113.29])
	(authenticated bits=0)
	by opus.cs.columbia.edu (8.12.9/8.12.9) with ESMTP id h6T42fTx004202
	(version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT)
	for <linux-fsdevel@vger.kernel.org>; Tue, 29 Jul 2003 00:02:42 -0400 (EDT)
To: linux-fsdevel@vger.kernel.org
List-Id: linux-fsdevel.vger.kernel.org

I'm trying to use d_path() inside a stackable filesystems (using fist),
but it only figures out the path until the mount point of the stackable
fs.  Is this a limitation of the d_path algorithm, fist, both?  any way
of me working around it?

as far as I can tell it's because of this piece of code

      if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry) )  {
         /* Global root? */
       if (vfsmnt->mnt_parent == vfsmnt)
            goto global_root;

namely the vfsmnt->mnt_parent == vfsmnt.

any ideas on how I can work around it?

thanks,

shaya