rbd: move radosNamespace to RBD section

As radosNamespace is more specific to
RBD not the general ceph configuration. Now
we introduced a new RBD section for RBD specific
options, Moving the radosNamespace to RBD section
and keeping the radosNamespace still under the
global ceph level configration for backward
compatibility.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
(cherry picked from commit b4acbd08a5)

docs/design/proposals/clusterid-mapping.md

@@ -44,7 +44,9 @@ data:
     [
       {
        "clusterID": "rook-ceph",
-       "radosNamespace": "<rados-namespace>",
+       "rbd": {
+          "radosNamespace": "<rados-namespace>",
+       },
        "monitors": [
          "192.168.39.82:6789"
        ],
@@ -54,7 +56,9 @@ data:
       },
       {
        "clusterID": "fs-id",
-       "radosNamespace": "<rados-namespace>",
+       "rbd": {
+          "radosNamespace": "<rados-namespace>",
+       },
        "monitors": [
          "192.168.39.83:6789"
        ],

e2e/configmap.go

@@ -60,9 +60,14 @@ func createConfigMap(pluginPath string, c kubernetes.Interface, f *framework.Fra
 		return err
 	}
 	conmap := []util.ClusterInfo{{
-		ClusterID:      fsID,
-		Monitors:       mons,
-		RadosNamespace: radosNamespace,
+		ClusterID: fsID,
+		Monitors:  mons,
+		RBD: struct {
+			NetNamespaceFilePath string `json:"netNamespaceFilePath"`
+			RadosNamespace       string `json:"radosNamespace"`
+		}{
+			RadosNamespace: radosNamespace,
+		},
 	}}
 	if upgradeTesting {
 		subvolumegroup = "csi"
@@ -132,7 +137,7 @@ func createCustomConfigMap(
 			case "radosNamespace":
 				for c := range conmap {
 					if conmap[c].ClusterID == cluster {
-						conmap[c].RadosNamespace = j
+						conmap[c].RBD.RadosNamespace = j
 					}
 				}
 			}

examples/csi-config-map-sample.yaml

@@ -13,9 +13,9 @@ kind: ConfigMap
 # each such cluster in use.
 # To add more clusters or edit MON addresses in an existing configmap, use
 # the `kubectl replace` command.
-# The <rados-namespace> is optional and represents a radosNamespace in the pool.
-# If any given, all of the rbd images, snapshots, and other metadata will be
-# stored within the radosNamespace.
+# The "rbd.rados-namespace" is optional and represents a radosNamespace in the
+# pool. If any given, all of the rbd images, snapshots, and other metadata will
+# be stored within the radosNamespace.
 # NOTE: The given radosNamespace must already exists in the pool.
 # NOTE: Make sure you don't add radosNamespace option to a currently in use
 # configuration as it will cause issues.
@@ -42,9 +42,9 @@ data:
     [
       {
         "clusterID": "<cluster-id>",
-        "radosNamespace": "<rados-namespace>",
         "rbd": {
            "netNamespaceFilePath": "<kubeletRootPath>/plugins/rbd.csi.ceph.com/net",
+           "radosNamespace": "<rados-namespace>",
         },
         "monitors": [
           "<MONValue1>",

internal/util/csiconfig.go

@@ -41,7 +41,7 @@ type ClusterInfo struct {
 	// ClusterID is used for unique identification
 	ClusterID string `json:"clusterID"`
 	// RadosNamespace is a rados namespace in the pool
-	RadosNamespace string `json:"radosNamespace"`
+	RadosNamespace string `json:"radosNamespace"` // For backward compatibility. TODO: Remove this in 3.7.0
 	// Monitors is monitor list for corresponding cluster ID
 	Monitors []string `json:"monitors"`
 	// CephFS contains CephFS specific options
@@ -54,18 +54,22 @@ type ClusterInfo struct {
 	RBD struct {
 		// symlink filepath for the network namespace where we need to execute commands.
 		NetNamespaceFilePath string `json:"netNamespaceFilePath"`
+		// RadosNamespace is a rados namespace in the pool
+		RadosNamespace string `json:"radosNamespace"`
 	} `json:"rbd"`
 }
 
 // Expected JSON structure in the passed in config file is,
 // [
 // 	{
-// 		"clusterID": "<cluster-id>",
-//		"radosNamespace": "<rados-namespace>",
-// 		"monitors":
-// 			[
-// 				"<monitor-value>",
-// 				"<monitor-value>",
+//      "clusterID": "<cluster-id>",
+//      "rbd": {
+//		   "radosNamespace": "<rados-namespace>"
+//       },
+//      "monitors":
+//       [
+//         "<monitor-value>",
+//         "<monitor-value>",
 // 				...
 // 			],
 //         "cephFS": {
@@ -121,6 +125,10 @@ func GetRadosNamespace(pathToConfig, clusterID string) (string, error) {
 		return "", err
 	}
 
+	if cluster.RBD.RadosNamespace != "" {
+		return cluster.RBD.RadosNamespace, nil
+	}
+
 	return cluster.RadosNamespace, nil
 }
 

internal/util/csiconfig_test.go

@@ -170,6 +170,7 @@ func TestGetRBDNetNamespaceFilePath(t *testing.T) {
 			Monitors:  []string{"ip-1", "ip-2"},
 			RBD: struct {
 				NetNamespaceFilePath string `json:"netNamespaceFilePath"`
+				RadosNamespace       string `json:"radosNamespace"`
 			}{
 				NetNamespaceFilePath: "/var/lib/kubelet/plugins/rbd.ceph.csi.com/cluster1-net",
 			},
@@ -179,6 +180,7 @@ func TestGetRBDNetNamespaceFilePath(t *testing.T) {
 			Monitors:  []string{"ip-3", "ip-4"},
 			RBD: struct {
 				NetNamespaceFilePath string `json:"netNamespaceFilePath"`
+				RadosNamespace       string `json:"radosNamespace"`
 			}{
 				NetNamespaceFilePath: "/var/lib/kubelet/plugins/rbd.ceph.csi.com/cluster2-net",
 			},