linux-kernel - Re: [RFC PATCH 1/2] Union Mount: glibc readdir support

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Message-Id: <200805120349.m4C3nZdI018467@agora.fsl.cs.sunysb.edu>
Date:	Sun, 11 May 2008 23:49:35 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	bharata@...ux.vnet.ibm.com
Cc:	David Newall <davidn@...idnewall.com>,
	Ulrich Drepper <drepper@...hat.com>, bsn.0007@...il.com,
	libc-alpha@...rceware.org, Jan Blunck <jblunck@...e.de>,
	Erez Zadok <ezk@...sunysb.edu>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	Christoph Hellwig <hch@....de>, Mingming Cao <cmm@...ibm.com>,
	Dave Hansen <haveblue@...ibm.com>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [RFC PATCH 1/2] Union Mount: glibc readdir support 

In message <20080512034341.GA10541@...ibm.com>, Bharata B Rao writes:

> Answering my question to Erez that I raised in another thread, I see
> that Unionfs doesn't set the export_operations in it's superblock and
> hence I believe unions created by Unionfs aren't NFS-exportable as of
> know. Erez, correct me if I got it wrong.

Yes, the unionfs in -mm isn't nfs exportable safely, b/c it doesn't have
persistent inode numbers.  Our unionfs-odf version has persistent inode
numbers and is exportable (see http://unionfs.filesystems.org/).

> Regards,
> Bharata.

Erez.
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