From 11d8a6e3719519fbc0e2c9d61b6fa931b84bf813 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Mon, 26 Jul 2010 11:57:07 +1000
Subject: [PATCH] md/raid5: export is_congested test

the dm module will need this for dm-raid45.

Also only access ->queue->backing_dev_info->congested_fn
if ->queue actually exists.  It won't in a dm target.

Signed-off-by: NeilBrown <neilb@suse.de>
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