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Date: Wed, 29 Jun 2011 10:40:01 -0700
From: Sunil Mushran <sunil.mushran@oracle.com>
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Subject: Re: [PATCH] xfstests 255: add a seek_data/seek_hole tester
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To: Christoph Hellwig <hch@infradead.org>
Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, xfs@oss.sgi.com, viro@ZenIV.linux.org.uk, linux-fsdevel@vger.kernel.org, P?draig Brady <P@draigBrady.com>, Josef Bacik <josef@redhat.com>

On 06/29/2011 10:36 AM, Christoph Hellwig wrote:
> 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.

A feature fewer file systems support than fallocate(). ;)

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