linux-ext4 - Re: [PATCH] ext4: Need clear buffer_delay after page writeout for delayed allocation

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Message-Id: <1212378632.4368.79.camel@localhost.localdomain>
Date:	Sun, 01 Jun 2008 20:50:32 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	jack@...e.cz, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Need clear buffer_delay after page writeout for
	delayed allocation

On Mon, 2008-06-02 at 08:44 +0530, Aneesh Kumar K.V wrote:
> On Sun, Jun 01, 2008 at 02:10:02PM -0700, Mingming Cao wrote:
> > ext4:  Need clear buffer_delay after page writeout for delayed allocation
> > 
> > From: Mingming Cao <cmm@...ibm.com>
> > 
> > Need clear buffer_delay in ext4_da_writepage() after page has been writeout
> > 
> > Signed-off-by: Mingming Cao <cmm@...ibm.com>
> > 
> > ---
> 
> We do that in mpage_put_bnr_to_bhs.
> 
Normally delayed buffer could be cleared in that case, but if allocation
failed in __mapge_da_writepages(), it will keep buffer_delay marked and
deferring to later ext4_da_writepage() to do block allocation. This
patch handles clear bh delay bit in this case.

Mingming

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