[PATCH] xfstests 255: add a seek_data/seek_hole tester

[Christoph Hellwig]

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.