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

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Message-ID: <20070108232516.GB1269@filer.fsl.cs.sunysb.edu>
Date:	Mon, 8 Jan 2007 18:25:16 -0500
From:	Josef Sipek <jsipek@....cs.sunysb.edu>
To:	Andrew Morton <akpm@...l.org>
Cc:	Shaya Potter <spotter@...columbia.edu>,
	"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	hch@...radead.org, viro@....linux.org.uk, torvalds@...l.org,
	mhalcrow@...ibm.com, David Quigley <dquigley@....cs.sunysb.edu>,
	Erez Zadok <ezk@...sunysb.edu>
Subject: Re: [PATCH 01/24] Unionfs: Documentation

On Mon, Jan 08, 2007 at 01:19:57PM -0800, Andrew Morton wrote:
... 
> If it's not in the changelog or the documentation, it doesn't exist.

Good point. I'll add it for next time.

> >  It's the same thing as modifying a block 
> > device while a file system is using it.  Now, when unionfs gets confused, 
> > it shouldn't oops, but would one expect ext3 to allow one to modify its 
> > backing store while its using it?
> 
> There's no such problem with bind mounts.  It's surprising to see such a
> restriction with union mounts.

Bind mounts are a purely VFS level construct. Unionfs is, as the name
implies, a filesystem. Last year at OLS, it seemed that a lot of people
agreed that unioning is neither purely a fs construct, nor purely a vfs
construct.

I'm using Unionfs (and ecryptfs) as guinea pigs to make linux fs stacking
friendly - a topic to be discussed at LSF in about a month.

Josef "Jeff" Sipek.

-- 
Computer Science is no more about computers than astronomy is about
telescopes.
		- Edsger Dijkstra
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