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

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Message-Id: <1168291848.9853.1.camel@localhost.localdomain>
Date:	Mon, 08 Jan 2007 16:30:48 -0500
From:	Shaya Potter <spotter@...columbia.edu>
To:	Andrew Morton <akpm@...l.org>
Cc:	"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, 2007-01-08 at 13:19 -0800, Andrew Morton wrote:
> On Mon, 8 Jan 2007 14:43:39 -0500 (EST) Shaya Potter <spotter@...columbia.edu> wrote:
> >  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.

the difference is bind mounts are a vfs construct, while unionfs is a
file system.

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