From: Martin Wilck mwilck@suse.com
[ 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 --- drivers/nvme/host/multipath.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 36db7d2e6a896..2c94e084a61b8 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -246,6 +246,12 @@ 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;