linux-kernel - Re: [PATCH] ext4: return correct wbc.nr_to_write in ext4_da

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Message-ID: <20091225201048.GF32757@thunk.org>
Date:	Fri, 25 Dec 2009 15:10:48 -0500
From:	tytso@....edu
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	Richard Kennedy <richard@....demon.co.uk>, adilger@....com,
	linux-ext4@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ext4: return correct wbc.nr_to_write in
 ext4_da_writepages

On Thu, Dec 17, 2009 at 11:02:32PM +0530, Aneesh Kumar K.V wrote:
> On Thu, Dec 17, 2009 at 09:40:25AM -0600, Eric Sandeen wrote:
> > Richard Kennedy wrote:
> > > ext4: always re-base nr_to_write in ext4_da_writepages
> > > 
> > > When ext4_da_writepages increases the nr_to_write in writeback_control
> > > then it must always re-base the return value.
> > > 
> > > Without this change, when wb_writeback calculates how many pages were
> > > actually written it can get a negative value and loop more times than
> > > necessary. In tests I have seen nearly all the dirty pages pushed out to
> > > writeback due to this issue.
> > > 
> > > Signed-off-by: Richard Kennedy <richard@....demon.co.uk>

Added to the ext4 patch queue, thanks.

				- Ted
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