From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Thu, 16 Feb 2012 10:34:37 +0000 (+0800)
Subject: Btrfs: skip states when they does not contain bits to clear
X-Git-Tag: v3.3-rc5~9^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0449314a9cc5a7fb0bd42e2175a3c46f68f3a2b0;p=pandora-kernel.git

Btrfs: skip states when they does not contain bits to clear

Clearing a range's bits is different with setting them, since we don't
need to touch them when states do not contain bits we want.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
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