linux-kernel - Re: union mount status

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Message-ID: <48F650E3.8040805@fr.ibm.com>
Date:	Wed, 15 Oct 2008 22:21:55 +0200
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	Jan Blunck <jblunck@...e.de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	bharata@...ux.vnet.ibm.com
Subject: Re: union mount status

Jan Blunck wrote:
> On Wed, Oct 15, Daniel Lezcano wrote:
> 
>> Hi all,
>>
>> What is the status of this patchset ?
>> Bharata Rao told me, no consensus was reached yet.
>> After looking at Jan Blunk's ftp server, it looks like the latest 
>> patchset was for 2.6.25-mm1. Is anyone working on this patchset right now ?
> 
> Not that I know of.
> 
> The state is as follows: we (David Woodhouse, Bharata Rao, Erez Zadok and me)
> agreed on a more or less final version of the whiteout patches. I haven't
> posted them yet since I know that Al Viro isn't convinced of the idea that
> they are actaully necessary. 

The union mount could *very* interesting for the containers (aka 
namespaces). If you create a container, you can share the same rootfs 
between  the different containers and make a COW for each container 
writing on its own filesystem, no ? Using together the mount namespaces, 
the union mount and the ro bind mount, can be very powerful IMHO.

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