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

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Message-ID: <Pine.LNX.4.61.0705220824320.4452@yvahk01.tjqt.qr>
Date:	Tue, 22 May 2007 08:25:16 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
cc:	Shaya Potter <spotter@...columbia.edu>,
	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


On May 22 2007 08:43, Bharata B Rao wrote:
>On Fri, May 18, 2007 at 09:47:31AM -0400, Shaya Potter wrote:
>> 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.
>
>But it only breaks the semantics (in other cases we allow writes only to the
>top layer files). So the question is why do we have to copy up the device
>node ? What difference it makes to writing to the device itself ?

Because `chmod 666 blockdevnode` is not the same as writing
to the device itself?

>Currently we allow write to the device using the lower layer device node
>itself.


	Jan
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