From: Stefan Behrens <sbehrens@giantdisaster.de>
Date: Tue, 27 Nov 2012 16:10:21 +0000 (+0000)
Subject: Btrfs: fix race in check-integrity caused by usage of bitfield
X-Git-Tag: v3.8-rc1~71^2~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb3806ec88a7e1e9d1fbde34cbc0bf153b7e7c3f;p=pandora-kernel.git

Btrfs: fix race in check-integrity caused by usage of bitfield

The structure member mirror_num is modified concurrently to the
structure member is_iodone. This doesn't require any locking by
design, unless everything is stored in the same 32 bits of a
bit field. This was the case and xfstest 284 was able to
trigger false warnings from the checker code. This patch
seperates the bits and fixes the race.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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