linux-kernel - Re: [PATCH] eCryptfs: Delay writing 0's after llseek until write

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Date:	Tue, 22 May 2007 09:51:25 -0500
From:	Michael Halcrow <mhalcrow@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] eCryptfs: Delay writing 0's after llseek until write

On Mon, May 21, 2007 at 09:07:08PM -0700, Andrew Morton wrote:
> On Mon, 21 May 2007 18:00:21 -0500 Michael Halcrow <mhalcrow@...ibm.com> wrote:
> 
> > Delay writing 0's out in eCryptfs after a seek past the end of the
> > file until data is actually written.
> 
> a) why?

http://www.opengroup.org/onlinepubs/009695399/functions/lseek.html

``The lseek() function shall not, by itself, extend the size of a
file.''

> b) what is the impact upon a user of them not having this patch?

Applications that lseek() past the end of the file without writing
will experience unexpected behavior.

Mike
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