From: Ted Ts'o <tytso@mit.edu>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP
 related?)
Date: Tue, 19 Apr 2011 10:09:09 -0400
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Cc: Yongqiang Yang <xiaoqiangnk@gmail.com>,
	Andreas Dilger <adilger@dilger.ca>,
	Eric Sandeen <sandeen@sandeen.net>, xfs-oss <xfs@oss.sgi.com>,
	"coreutils@gnu.org" <coreutils@gnu.org>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
	=?iso-8859-1?Q?P=E1draig?= Brady <P@draigbrady.com>,
	Markus Trippelsdorf <markus@trippelsdorf.de>
To: Dave Chinner <david@fromorbit.com>
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On Tue, Apr 19, 2011 at 05:45:38PM +1000, Dave Chinner wrote:
> You are *not listening*. There is no #2. FIEMAP returns the extent
> state _on disk_ at the time of the call.

Dave, you're being rather strident about your insistence about what
FIEMAP's semantics are.  Part of the problem here is that it's *not*
clear or settled.

If it really is the state _on_ _disk_, does XFS really have a DELALLOC
bit _on_ _disk_?

					- Ted