From 466d89a6bcd500f64896b514f78b32e8d0b0303a Mon Sep 17 00:00:00 2001
From: Keith Busch <keith.busch@intel.com>
Date: Fri, 17 Oct 2014 17:46:37 -0600
Subject: [PATCH] dm: prepare for allocating blk-mq clone requests in target

For blk-mq request-based DM the responsibility of allocating a cloned
request will be transfered from DM core to the target type.

To prepare for conditionally using this new model the original
request's 'special' now points to the dm_rq_target_io because the
clone is allocated later in the block layer rather than in DM core.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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