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Date: Wed, 29 Jun 2011 13:36:48 -0400
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] xfstests 255: add a seek_data/seek_hole tester
Message-ID: <20110629173648.GA22293@infradead.org>
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To: Sunil Mushran <sunil.mushran@oracle.com>
Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, xfs@oss.sgi.com, Christoph Hellwig <hch@infradead.org>, viro@ZenIV.linux.org.uk, linux-fsdevel@vger.kernel.org, P?draig Brady <P@draigBrady.com>, Josef Bacik <josef@redhat.com>

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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