From cbc4e3c1350beb47beab8f34ad9be3d34a20c705 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Mon, 27 Apr 2015 16:37:50 -0400
Subject: [PATCH] dm: do not allocate any mempools for blk-mq request-based DM

Do not allocate the io_pool mempool for blk-mq request-based DM
(DM_TYPE_MQ_REQUEST_BASED) in dm_alloc_rq_mempools().

Also refine __bind_mempools() to have more precise awareness of which
mempools each type of DM device uses -- avoids mempool churn when
reloading DM tables (particularly for DM_TYPE_REQUEST_BASED).

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