From a874a63e1389c1daabd5abe4e4faaf9d63daf474 Mon Sep 17 00:00:00 2001
From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Fri, 29 Jun 2012 03:58:46 -0600
Subject: [PATCH] Btrfs: check write access to mount earlier while creating
 snapshots

Move check of write access to mount into upper functions so that we can
use mnt_want_write_file instead, which is faster than mnt_want_write.

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