linux-ext4 - Re: [PATCH 3/3] vfs: Add BUG_ON for delayed and unwritten extentsin submit

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Message-ID: <20090512045210.GC6753@skywalker>
Date:	Tue, 12 May 2009 10:22:10 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Theodore Tso <tytso@....edu>
Cc:	cmm@...ibm.com, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3] vfs: Add BUG_ON for delayed and unwritten
	extentsin submit_bh

On Mon, May 11, 2009 at 11:17:09PM -0400, Theodore Tso wrote:
> On Thu, May 07, 2009 at 04:09:30PM +0530, Aneesh Kumar K.V wrote:
> > We should not do submit_bh for delayed and unwritten extents. So
> > add a BUG_ON on them.
> 
> Hmm, maybe we should add a BUG_ON(buffer_new(bh)) here to?  That flag
> should never leak out to submit_bh as well, right?
> 

Yes . But since BH_New is used by all the filesystems we need to
verify them and make sure other filesystems gets it right. IIUC BH_Delay and
BH_Unwritten are only used by ext4, xfs and btrfs

-aneesh
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