tree 864b9d4285433c812e8d5af10dd453457f51d9f5
parent 8cd2807f79b73ef2d8c1cb6b3732dc5758ac7212
author Miao Xie <miaox@cn.fujitsu.com> 1353919387 +0000
committer Chris Mason <chris.mason@fusionio.com> 1355708769 -0500

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>