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

To: Jim Meyering <jim@xxxxxxxxxxxx>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 15 Apr 2011 13:16:29 -0400
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, P?draig Brady <P@xxxxxxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, Eric Sandeen <sandeen@xxxxxxxxxxx>, coreutils@xxxxxxx, Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>
In-reply-to: <87sjtjq4ir.fsf@xxxxxxxxxxxxxxxx>
References: <20110414102608.GA1678@xxxxxxxxxxxxxx> <20110414120635.GB1678@xxxxxxxxxxxxxx> <20110414140222.GB1679@xxxxxxxxxxxxxx> <4DA70BD3.1070409@xxxxxxxxxxxxxx> <4DA717B2.3020305@xxxxxxxxxxx> <20110414225904.GK21395@dastard> <4DA7836A.5040604@xxxxxxxxxxxxxx> <20110415000940.GL21395@dastard> <87sjtjq4ir.fsf@xxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
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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