linux-kernel - Re: [PATCH] fs: nobh_truncate

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Message-Id: <1173136211.9109.81.camel@kleikamp.austin.ibm.com>
Date:	Mon, 05 Mar 2007 17:10:11 -0600
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Will Trives <will@...vescon.com.au>,
	linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Chuck Ebbert <cebbert@...hat.com>
Subject: Re: [PATCH] fs: nobh_truncate_page() fix

On Mon, 2007-03-05 at 14:57 -0800, Andrew Morton wrote:
> Is OK, I think.  nobh_prepare_write() brings the outside-from-and-to
> sections of the page uptodate and memset in nobh_truncate_page() brings the
> rest of the page uptodate.
> 
> We bring the to->PAGE_CACHE_SIZE section uptodate twice, which could be
> optimised.

Why not have nobh_truncate_page() call prepare_write() with to =
PAGE_CACHE_SIZE?  I don't really grok:

to = (offset + blocksize) & ~(blocksize - 1);
-- 
David Kleikamp
IBM Linux Technology Center

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