From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Date: Sun, 7 Apr 2013 10:50:17 +0000 (+0000)
Subject: Btrfs: remove some unnecessary spin_lock usages
X-Git-Tag: v3.10-rc1~31^2~67
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=58400fce5ac5939aadac8ce682edc192c6172f80;p=pandora-kernel.git

Btrfs: remove some unnecessary spin_lock usages

We use mutex lock to protect all the user change operations.
So when we are calling find_qgroup_rb() to check whether qgroup
exists, we don't have to hold spin_lock.

Besides, when enabling/disabling quota, it must be single thread
when operations come here. spin lock must be firstly used to
clear quota_root when disabling quota, while enabling quota, spin
lock must be used to complete the last assign work.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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