linux-ext4 - Re: [Ocfs2-devel] [PATCH] ocfs2: Implement llseek()

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Message-ID: <4DD55364.8070002@oracle.com>
Date:	Thu, 19 May 2011 10:29:08 -0700
From:	Sunil Mushran <sunil.mushran@...cle.com>
To:	Christoph Hellwig <hch@....de>
CC:	josef@...hat.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-btrfs@...r.kernel.org,
	linux-ext4@...r.kernel.org, viro@...IV.linux.org.uk,
	ocfs2-devel@....oracle.com
Subject: Re: [Ocfs2-devel] [PATCH] ocfs2: Implement llseek()

On 05/19/2011 04:05 AM, Christoph Hellwig wrote:
> On Wed, May 18, 2011 at 07:44:44PM -0700, Sunil Mushran wrote:
>> Unwritten (preallocated) extents are considered holes because the file system
>> treats reads to such regions in the same way as it does to holes.
> How does this work for the case of an unwrittent extent that has been
> written to in the pagecache but not converted yet?  Y'know the big data
> corruption and flamewar that started all this?

We don't delay splitting the extent. It is split in ->write_begin(). Delaying
it will be a challenge as we have to provide cache coherency across the
cluster.

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