cephfs: add read affinity mount option

This commit makes use of crush location labels from node
labels to supply `crush_location` and `read_from_replica=localize`
options during mount. Using these options, cephfs
will be able to redirect reads to the closest OSD,
improving performance.

Signed-off-by: Praveen M <m.praveen@ibm.com>

internal/csi-common/nodeserver-default.go

@@ -31,6 +31,10 @@ type DefaultNodeServer struct {
 	Driver  *CSIDriver
 	Type    string
 	Mounter mount.Interface
+	// NodeLabels stores the node labels
+	NodeLabels map[string]string
+	// CLIReadAffinityOptions contains map options passed through command line to enable read affinity.
+	CLIReadAffinityOptions string
 }
 
 // NodeGetInfo returns node ID.