linux-kernel - Re: [PATCH 2/2] ocfs2: No need to zero pages past i_size. i

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Message-ID: <20100706071031.GE13023@mail.oracle.com>
Date:	Tue, 6 Jul 2010 00:10:31 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Tao Ma <tao.ma@...cle.com>
Cc:	Dave Chinner <david@...morbit.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	ocfs2-devel@....oracle.com, Dave Chinner <dchinner@...hat.com>,
	Christoph Hellwig <hch@....de>, Mark Fasheh <mfasheh@...e.com>
Subject: Re: [PATCH 2/2] ocfs2: No need to zero pages past i_size. i_size v2

On Mon, Jul 05, 2010 at 09:38:42AM +0800, Tao Ma wrote:
> btw, do we ever have a chance that start + wc->w_num_pages >
> end_index? I can't find it.

	Of course.  If you have a 1MB clustersize, w_num_pages will be
256.  But if you are only writing the first page of the cluster,
end_index is only 1.

Joel

-- 

"If you took all of the grains of sand in the world, and lined
 them up end to end in a row, you'd be working for the government!"
	- Mr. Interesting

Joel Becker
Consulting Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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