linux-kernel - Re: [PATCH 01/24] Unionfs: Documentation

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Message-ID: <20070109104333.GC25438@filer.fsl.cs.sunysb.edu>
Date:	Tue, 9 Jan 2007 05:43:33 -0500
From:	Josef Sipek <jsipek@....cs.sunysb.edu>
To:	Christoph Hellwig <hch@...radead.org>,
	Erez Zadok <ezk@...sunysb.edu>, Andrew Morton <akpm@...l.org>,
	Shaya Potter <spotter@...columbia.edu>,
	"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@....linux.org.uk, torvalds@...l.org, mhalcrow@...ibm.com,
	David Quigley <dquigley@...sunysb.edu>
Subject: Re: [PATCH 01/24] Unionfs: Documentation

On Tue, Jan 09, 2007 at 09:53:45AM +0000, Christoph Hellwig wrote:
> On Mon, Jan 08, 2007 at 07:03:35PM -0500, Erez Zadok wrote:
> > However, I must caution that a file system like ecryptfs is very different
> > from Unionfs, the latter being a fan-out file system---and both have very
> > different goals.  The common code between the two file systems, at this
> > stage, is not much (and we've already extracted some of it into the "stackfs
> > layer").
> 
> I think that's an very important point.  We have a chance to get that
> non-fanout filesystems right quite easily - something I wished that would
> have been done before the ecryptfs merge - while getting fan-out stackable
> filesystems is a really hard task.

Hard or harder?

> In addition to that I know exactly
> one fan-out stackable filesystem that is posisbly useful, which is unionfs.

RAIF is another fan-out stackable fs with much more complex logic. (Just the
other day, I saw an announcement for a new version on fsdevel.)

Josef "Jeff" Sipek.

-- 
Evolution, n.:
  A hypothetical process whereby infinitely improbable events occur with
  alarming frequency, order arises from chaos, and no one is given credit.
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