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

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Date:	Tue, 19 Apr 2011 10:09:09 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Dave Chinner <david@...morbit.com>
Cc:	Yongqiang Yang <xiaoqiangnk@...il.com>,
	Andreas Dilger <adilger@...ger.ca>,
	Eric Sandeen <sandeen@...deen.net>, xfs-oss <xfs@....sgi.com>,
	"coreutils@....org" <coreutils@....org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Pádraig Brady <P@...igbrady.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP
 related?)

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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