From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Thu, 13 Feb 2014 03:19:47 +0000 (+0800)
Subject: Btrfs: skip locking when searching commit root
X-Git-Tag: v3.15-rc1~96^2~56
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e84752d434b5cca0869e906e7b94d0531b25c6d3;p=pandora-kernel.git

Btrfs: skip locking when searching commit root

We won't change commit root, skip locking dance with commit root
when walking backrefs, this can speed up btrfs send operations.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
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