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Date: Tue, 19 Apr 2011 10:09:09 -0400
From: "Ted Ts'o" <tytso@mit.edu>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
Message-ID: <20110419140909.GD3030@thunk.org>
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To: Dave Chinner <david@fromorbit.com>
Cc: Andreas Dilger <adilger@dilger.ca>, Eric Sandeen <sandeen@sandeen.net>, Yongqiang Yang <xiaoqiangnk@gmail.com>, 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>

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

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