linux-kernel - Re: [RFC][PATCH 10/14] In-kernel file copy between union mounted filesystems

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Message-ID: <464DAE73.7000302@cs.columbia.edu>
Date:	Fri, 18 May 2007 09:47:31 -0400
From:	Shaya Potter <spotter@...columbia.edu>
To:	bharata@...ux.vnet.ibm.com
CC:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Jan Blunck <j.blunck@...harburg.de>
Subject: Re: [RFC][PATCH 10/14] In-kernel file copy between union mounted
 filesystems

Bharata B Rao wrote:

> 
> Not really. This is called during copyup of a file residing in a lower
> layer. And that is done only for regular files.

That is broken.

You should be able to change the permissions on a device node on a layer 
that is RO.

so it would copy it up (1. mknod, 2. copy attributes) and then the 
appropriate attribute notification change would be called.
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