linux-kernel - Re: [PATCH] xfstests 255: add a seek_data/seek

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Date:	Wed, 29 Jun 2011 13:36:48 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Sunil Mushran <sunil.mushran@...cle.com>
Cc:	P?draig Brady <P@...igBrady.com>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Josef Bacik <josef@...hat.com>, linux-fsdevel@...r.kernel.org,
	viro@...IV.linux.org.uk, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, xfs@....sgi.com
Subject: Re: [PATCH] xfstests 255: add a seek_data/seek_hole tester

On Wed, Jun 29, 2011 at 10:29:02AM -0700, Sunil Mushran wrote:
> I'm not too sure about that. Atleast not enabled by default. Most users
> use cp to backup data. Not empty space. In this case, this empty extent
> may not even be de-dupable.
> 
> Frankly I'd be happier of cp started to exploited fallocate() to create larger
> extents before copying data into them. Atleast for the large files.

That's what delayed allocation is for.
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