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nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths

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When nvme_round_robin_path() finds a valid namespace we should be using it;
falling back to __nvme_find_path() for non-optimized paths will cause the
result from nvme_round_robin_path() to be ignored for non-optimized paths.

Fixes: 75c10e7327 ("nvme-multipath: round-robin I/O policy")
Signed-off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke 2020-07-27 18:08:03 +02:00 committed by Christoph Hellwig
parent 3f6e3246db
commit fbd6a42d89
1 changed files with 7 additions and 4 deletions
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11
drivers/nvme/host/multipath.c
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@ -281,10 +281,13 @@ inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)
struct nvme_ns *ns;
ns = srcu_dereference(head->current_path[node], &head->srcu);
if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns)
ns = nvme_round_robin_path(head, node, ns);
if (unlikely(!ns || !nvme_path_is_optimized(ns)))
ns = __nvme_find_path(head, node);
if (unlikely(!ns))
return __nvme_find_path(head, node);
if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR)
return nvme_round_robin_path(head, node, ns);
if (unlikely(!nvme_path_is_optimized(ns)))
return __nvme_find_path(head, node);
return ns;
}