From c81d57679ee4b87a5b50e9afe4e5d1866d08b9ad Mon Sep 17 00:00:00 2001
From: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Date: Thu, 5 Jun 2014 10:02:51 +0800
Subject: [PATCH] btrfs: replace EINVAL with EOPNOTSUPP for dev_replace raid56

To return EOPNOTSUPP is more user friendly than to return EINVAL,
and then user-space tool will show that the dev_replace operation
for raid56 is not currently supported rather than showing that
there is an invalid argument.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
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