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nvme-multipath: fix logic for non-optimized paths

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[ Upstream commit 3f6e3246db0e6f92e784965d9d0edb8abe6c6b74 ]

Handle the special case where we have exactly one optimized path,
which we should keep using in this case.

Fixes: 75c10e732724 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Martin Wilck 2020-07-27 18:08:02 +02:00 committed by Greg Kroah-Hartman
parent 4e8691ba0e
commit f0a8c0254f
1 changed files with 6 additions and 0 deletions
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6
drivers/nvme/host/multipath.c
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@ -249,6 +249,12 @@ static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head,
fallback = ns;
}
/* No optimized path found, re-check the current path */
if (!nvme_path_is_disabled(old) &&
old->ana_state == NVME_ANA_OPTIMIZED) {
found = old;
goto out;
}
if (!fallback)
return NULL;
found = fallback;