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

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
From: "Ted Ts'o" <tytso@xxxxxxx>
Date: Tue, 19 Apr 2011 10:09:09 -0400
Cc: Yongqiang Yang <xiaoqiangnk@xxxxxxxxx>, Andreas Dilger <adilger@xxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>, "coreutils@xxxxxxx" <coreutils@xxxxxxx>, "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>, Pádraig Brady <P@xxxxxxxxxxxxxx>, Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>
In-reply-to: <20110419074538.GG23985@dastard>
References: <76FFF648-CA02-494B-A862-566C66A8CB82@xxxxxxxxx> <20110416005040.GP21395@dastard> <E7438588-5C5A-42B9-9B6C-FADF7CAC6D3A@xxxxxxxxx> <4EEEA16E-1FDB-4430-A372-8F8701196E4C@xxxxxxx> <20110418004040.GS21395@dastard> <6C89E159-A5F6-4A06-A3D2-273BE4CFB9B5@xxxxxxxxx> <BANLkTin=WEpSf6ddiOMNMOpCPP-wiEttSw@xxxxxxxxxxxxxx> <20110419034455.GB23985@dastard> <BANLkTinjh968ECqAobQ677hnV5yzke1ncw@xxxxxxxxxxxxxx> <20110419074538.GG23985@dastard>
User-agent: Mutt/1.5.20 (2009-06-14)
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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