From: Miao Xie <miaox@cn.fujitsu.com>
Date: Wed, 3 Sep 2014 13:35:47 +0000 (+0800)
Subject: Btrfs: modify rw_devices counter under chunk_mutex context
X-Git-Tag: fixes-against-v3.18-rc2~120^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c3929c3624e1764855e5a452728aec201b18b42a;p=pandora-kernel.git

Btrfs: modify rw_devices counter under chunk_mutex context

rw_devices counter is often used to tune the profile when doing chunk allocation,
so we should modify it under the chunk_mutex context to avoid getting wrong
chunk profile.

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