cephfs: set cluster Name as metadata on the subvolume

This change helps read the cluster name from the cmdline args,
the provisioner will set the same on the subvolume.

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>

internal/cephfs/core/metadata.go

@@ -21,6 +21,11 @@ import (
 	"strings"
 )
 
+const (
+	// clusterNameKey cluster Key, set on cephfs subvolume.
+	clusterNameKey = "csi.ceph.com/cluster/name"
+)
+
 // setMetadata sets custom metadata on the subvolume in a volume as a
 // key-value pair.
 func (s *subVolumeClient) setMetadata(key, value string) error {
@@ -52,6 +57,14 @@ func (s *subVolumeClient) SetAllMetadata(parameters map[string]string) error {
 		}
 	}
 
+	if s.clusterName != "" {
+		err := s.setMetadata(clusterNameKey, s.clusterName)
+		if err != nil {
+			return fmt.Errorf("failed to set metadata key %q, value %q on subvolume %v: %w",
+				clusterNameKey, s.clusterName, s, err)
+		}
+	}
+
 	return nil
 }
 

internal/cephfs/core/volume.go

@@ -81,9 +81,10 @@ type SubVolumeClient interface {
 
 // subVolumeClient implements SubVolumeClient interface.
 type subVolumeClient struct {
-	*SubVolume                         // Embedded SubVolume struct.
-	clusterID  string                  // Cluster ID to check subvolumegroup and resize functionality.
-	conn       *util.ClusterConnection // Cluster connection.
+	*SubVolume                          // Embedded SubVolume struct.
+	clusterID   string                  // Cluster ID to check subvolumegroup and resize functionality.
+	clusterName string                  // Cluster name
+	conn        *util.ClusterConnection // Cluster connection.
 }
 
 // SubVolume holds the information about the subvolume.
@@ -97,11 +98,12 @@ type SubVolume struct {
 }
 
 // NewSubVolume returns a new subvolume client.
-func NewSubVolume(conn *util.ClusterConnection, vol *SubVolume, clusterID string) SubVolumeClient {
+func NewSubVolume(conn *util.ClusterConnection, vol *SubVolume, clusterID, clusterName string) SubVolumeClient {
 	return &subVolumeClient{
-		SubVolume: vol,
-		clusterID: clusterID,
-		conn:      conn,
+		SubVolume:   vol,
+		clusterID:   clusterID,
+		clusterName: clusterName,
+		conn:        conn,
 	}
 }