From 3c04ce01053413007b9df88313b8b8e17272b57b Mon Sep 17 00:00:00 2001
From: Miao Xie <miaox@cn.fujitsu.com>
Date: Mon, 26 Nov 2012 08:43:07 +0000
Subject: [PATCH] Btrfs: get write access when setting the default subvolume

When wen want to set the default subvolume, we must get write access, or
we will change the R/O file system.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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