From 0449314a9cc5a7fb0bd42e2175a3c46f68f3a2b0 Mon Sep 17 00:00:00 2001
From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Thu, 16 Feb 2012 18:34:37 +0800
Subject: [PATCH] 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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Reading git-format-patch failed