From 4e420c452b11edf9d510c8180ac66f529e5b6206 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Mon, 6 Oct 2014 13:48:51 +0100
Subject: [PATCH] dm bufio: switch from a huge hash table to an rbtree

Converting over to using an rbtree eliminates a fixed 8MB allocation
from vmalloc space for the hash table.

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