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Date: Fri, 15 Apr 2011 13:26:03 -0400
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
Message-ID: <20110415172603.GA20086@infradead.org>
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To: Eric Blake <eblake@redhat.com>
Cc: Eric Sandeen <sandeen@sandeen.net>, Jim Meyering <jim@meyering.net>, xfs-oss <xfs@oss.sgi.com>, Christoph Hellwig <hch@infradead.org>, coreutils@gnu.org, linux-ext4@vger.kernel.org, Markus Trippelsdorf <markus@trippelsdorf.de>

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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