Re: [PATCH] nvme-multipath: implement active-active round-robin path selector

[Sagi Grimberg]

@@ -85,7 +121,14 @@ static blk_qc_t nvme_ns_head_make_request(struct 
request_queue *q,
        int srcu_idx;

srcu_idx = srcu_read_lock(&head->srcu);

-       ns = nvme_find_path(head);
+       switch (head->mpath_policy) {
+       case NVME_MPATH_ROUND_ROBIN:
+               ns = nvme_find_path_rr(head);
+               break;
+       case NVME_MPATH_ACTIVE_STANDBY:
+       default:
+               ns = nvme_find_path(head);
+       }

If we grow multiple path selectors, would be more elegant to
use a callout mechanism.