From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Newall <davidn@davidnewall.com>
Subject: Re: [RFC PATCH 1/2] Union Mount: glibc readdir support
Date: Tue, 06 May 2008 22:40:28 +0930
Message-ID: <482058C4.8010104@davidnewall.com>
References: <20080429133201.GA9938@localhost.localdomain> <20080429133346.GB9938@localhost.localdomain> <48195E69.3030701@redhat.com> <20080506042117.GA29298@in.ibm.com>
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Cc: Ulrich Drepper <drepper@redhat.com>, bsn.0007@gmail.com,
	libc-alpha@sourceware.org, Jan Blunck <jblunck@suse.de>,
	Erez Zadok <ezk@cs.sunysb.edu>, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk,
	Christoph Hellwig <hch@lst.de>, Mingming Cao <cmm@us.ibm.com>,
	Dave Hansen <haveblue@us.ibm.com>,
	Trond Myklebust <trond.myklebust@fys.uio.no>,
	David Woodhouse <dwmw2@infradead.org>
To: bharata@linux.vnet.ibm.com
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Bharata B Rao wrote:
> Is dis-allowing NFS-exporting of unions an option ?

Is it that simple?  What about a union further in an NFS export?  What
about union-mounting after the tree has been NFS-exported?  If the
kernel won't fully merge unions then FS servers have to do whatever it
is that's being proposed for glibc.