From: Arne Jansen <sensille@gmx.net>
Date: Thu, 9 Aug 2012 06:16:53 +0000 (-0600)
Subject: Btrfs: fix race in run_clustered_refs
X-Git-Tag: v3.6-rc4~6^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=22cd2e7de7b0bd68fb668d23e1564707ca689510;p=pandora-kernel.git

Btrfs: fix race in run_clustered_refs

With commit

commit d1270cd91f308c9d22b2804720c36ccd32dbc35e
Author: Arne Jansen <sensille@gmx.net>
Date:   Tue Sep 13 15:16:43 2011 +0200

     Btrfs: put back delayed refs that are too new

I added a window where the delayed_ref's head->ref_mod code can diverge
from the sum of the remaining refs, because we release the head->mutex
in the middle. This leads to btrfs_lookup_extent_info returning wrong
numbers. This patch fixes this by adjusting the head's ref_mod with each
delayed ref we run.

Signed-off-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

Reading git-diff-tree failed