linux-kernel - Re: [PATCH 2/5] revoke: core code

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Message-ID: <Pine.LNX.4.64.0703161637001.26209@sbz-30.cs.Helsinki.FI>
Date:	Fri, 16 Mar 2007 16:45:39 +0200 (EET)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, hch@...radead.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH 2/5] revoke: core code

On Fri, 16 Mar 2007, Andrew Morton wrote:
> What you're trying to do here is very similar to truncate(), and truncate()
> has had a lot of work put into it, and it does work.

Indeed. revoke() is the same as truncate() without, well, the truncation 
part.

On Fri, 16 Mar 2007, Andrew Morton wrote:
> However, modifying i_size like this might be a problem - the inode could be
> dirty and it'll get written to disk!  Perhaps we could change i_size_read()
> to cheat and to return zero if there's a revoke in progress.

Hmph, it's probably going to get too painful so I'll look at adding some 
hooks to do_generic_mapping_read()...

			Pekka
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