From 61cfea9bb84d41b09e59822c33b3eb27acc48358 Mon Sep 17 00:00:00 2001
From: WuBo <wu.bo@cn.fujitsu.com>
Date: Tue, 26 Jul 2011 03:30:11 +0000
Subject: [PATCH] Btrfs: Protect the readonly flag of block group

The access for ro in btrfs_block_group_cache should be protected
because of the racy lock in relocation.

Signed-off-by: Wu Bo <wu.bo@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Reading git-format-patch failed