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| author | Hannes Reinecke <hare@suse.de> | 2020-07-27 19:08:03 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-07-29 08:45:22 +0300 |
| commit | fbd6a42d8932e172921c7de10468a2e12c34846b (patch) | |
| tree | e49b04f533229e6ee3e02a9684cdcd3f3682954c | |
| parent | 3f6e3246db0e6f92e784965d9d0edb8abe6c6b74 (diff) | |
| download | linux-fbd6a42d8932e172921c7de10468a2e12c34846b.tar.xz | |
nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths
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: 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>
| -rw-r--r-- | drivers/nvme/host/multipath.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 93c70e1591de..3ded54d2c9c6 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -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; } |