From adcc44472bacb227ebc0b1a8876efa5302474338 Mon Sep 17 00:00:00 2001
From: Heinz Mauelshagen <heinzm@redhat.com>
Date: Thu, 5 Jun 2014 15:23:09 +0100
Subject: [PATCH] dm bio prison: implement per bucket locking in the
 dm_bio_prison hash table

Split the single per bio-prison lock by using per bucket locking.  Per
bucket locking benefits both dm-thin and dm-cache targets by reducing
bio-prison lock contention.

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