linux-ext4 - extent counting fun

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Message-ID: <4C323184.8020401@redhat.com>
Date:	Mon, 05 Jul 2010 14:24:52 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: extent counting fun

[root@...t ~]# filefrag -B /mnt/test/file
/mnt/test/file: 34 extents found
[root@...t ~]# filefrag /mnt/test/file
/mnt/test/file: 1058 extents found, perfection would be 1 extent

Hum, is it 34 or 1058? :)

Older filefrag counted contiguous metadata as part of a contiguous
extent... newer filefrag works in fiemap query-only mode by default,
and just takes what fiemap tells it.  The inconsistency is weird
though, and led to a Red Hat bug that I'm inclined to NOTABUG... but
do people think this needs to be made any more consistent?

Should we hack ext3_fiemap() to include the checks for contiguous
metadata?  Or was that too shady/clever to start with ...? :)

-Eric
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