From 75da39bf256c27e25f395b191ead79f323772672 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Fri, 20 Feb 2015 12:58:03 +0000
Subject: [PATCH] dm cache policy mq: keep track of the number of entries in a
 multiqueue

Small optimisation, now queue_empty() doesn't need to walk all levels of
the multiqueue.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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