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

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Date:	Fri, 15 Apr 2011 13:16:29 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jim Meyering <jim@...ering.net>
Cc:	Dave Chinner <david@...morbit.com>,
	P?draig Brady <P@...igBrady.com>, linux-ext4@...r.kernel.org,
	Eric Sandeen <sandeen@...deen.net>, coreutils@....org,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	xfs-oss <xfs@....sgi.com>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)

On Fri, Apr 15, 2011 at 10:53:48AM +0200, Jim Meyering wrote:
> Can you or anyone else point to authoritative documentation
> (or even a summary of those "discussions") of FIEMAP semantics?

A large part of the problem is that there's none and the semantics
is a hode-podge of random flags that mostly make little sense
outside of fs developers debugging the layout that we created.  The
closest to a description is Documentation/filesystems/fiemap.txt
in the kernel tree, but that doesn't document most of the delicate
points.

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