From: Miao Xie <miaox@cn.fujitsu.com>
Date: Wed, 3 Sep 2014 13:35:39 +0000 (+0800)
Subject: Btrfs: fix unprotected system chunk array insertion
X-Git-Tag: fixes-against-v3.18-rc2~120^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe48a5c00f3c8087fc0a447caee2b5f9f97cf238;p=pandora-kernel.git

Btrfs: fix unprotected system chunk array insertion

We didn't protect the system chunk array when we added a new
system chunk into it, it would cause the array be corrupted
if someone remove/add some system chunk into array at the same
time. Fix it by chunk lock.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
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