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Date:	Fri, 15 Apr 2011 13:26:03 -0400
From:	Christoph Hellwig <>
To:	Eric Blake <>
Cc:	Christoph Hellwig <>,
	Jim Meyering <>,
	Eric Sandeen <>,
	Dave Chinner <>, xfs-oss <>,,,
	Markus Trippelsdorf <>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)

On Fri, Apr 15, 2011 at 11:24:19AM -0600, Eric Blake wrote:
> Would it be worth borrowing from Solaris' semantics and adding SEEK_HOLE
> and SEEK_DATA to lseek(2), as a higher level (less-detailed, but easier
> to define and easier to use) interface for discovering the regions of a
> file that only contain NUL bytes?

Yes, I've already suggested that both in this thread and on IRC.

For efficient copies it's the only usable interface.
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