nvme-multipath: prepare for "queue-depth" iopolicy

[ Upstream commit 3d7c2fd2 ]

This patch prepares for the introduction of a new iopolicy by breaking up
the nvme_find_path() code path into sub-routines.

Signed-off-by: John Meneghini <jmeneghi@redhat.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Stable-dep-of: 5dd18f09 ("nvme/multipath: Fix RCU list traversal to use SRCU primitive")
Signed-off-by: Sasha Levin <sashal@kernel.org>