linux-ext4 - Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)

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Message-ID: <20110415172603.GA20086@infradead.org>
Date:	Fri, 15 Apr 2011 13:26:03 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Eric Blake <eblake@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jim Meyering <jim@...ering.net>,
	Eric Sandeen <sandeen@...deen.net>,
	Dave Chinner <david@...morbit.com>, xfs-oss <xfs@....sgi.com>,
	coreutils@....org, linux-ext4@...r.kernel.org,
	Markus Trippelsdorf <markus@...ppelsdorf.de>
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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