From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Fri, 29 Jun 2012 09:58:46 +0000 (-0600)
Subject: Btrfs: check write access to mount earlier while creating snapshots
X-Git-Tag: v3.6-rc1~81^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a874a63e1389c1daabd5abe4e4faaf9d63daf474;p=pandora-kernel.git

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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