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

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Message-ID: <Pine.LNX.4.63.0701081442230.19059@razor.cs.columbia.edu>
Date:	Mon, 8 Jan 2007 14:43:39 -0500 (EST)
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, 8 Jan 2007, Andrew Morton wrote:

> On Sun,  7 Jan 2007 23:12:53 -0500
> "Josef 'Jeff' Sipek" <jsipek@...sunysb.edu> wrote:
>
>> +Modifying a Unionfs branch directly, while the union is mounted, is
>> +currently unsupported.
>
> Does this mean that if I have /a/b/ and /c/d/ unionised under /mnt/union, I
> am not allowed to alter anything under /a/b/ and /c/d/?  That I may only
> alter stuff under /mnt/union?
>
> If so, that sounds like a significant limitation.

haven't we been through this?  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?
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