feat(scheduling): move csi volume predicates to csi filter plugin

pkg/scheduler/framework/plugins/nodevolumelimits/utils.go

@@ -0,0 +1,81 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package nodevolumelimits
+
+import (
+	"strings"
+
+	v1 "k8s.io/api/core/v1"
+	storagev1 "k8s.io/api/storage/v1"
+	"k8s.io/apimachinery/pkg/util/sets"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	csilibplugins "k8s.io/csi-translation-lib/plugins"
+	"k8s.io/kubernetes/pkg/features"
+)
+
+// isCSIMigrationOn returns a boolean value indicating whether
+// the CSI migration has been enabled for a particular storage plugin.
+func isCSIMigrationOn(csiNode *storagev1.CSINode, pluginName string) bool {
+	if csiNode == nil || len(pluginName) == 0 {
+		return false
+	}
+
+	// In-tree storage to CSI driver migration feature should be enabled,
+	// along with the plugin-specific one
+	if !utilfeature.DefaultFeatureGate.Enabled(features.CSIMigration) {
+		return false
+	}
+
+	switch pluginName {
+	case csilibplugins.AWSEBSInTreePluginName:
+		if !utilfeature.DefaultFeatureGate.Enabled(features.CSIMigrationAWS) {
+			return false
+		}
+	case csilibplugins.GCEPDInTreePluginName:
+		if !utilfeature.DefaultFeatureGate.Enabled(features.CSIMigrationGCE) {
+			return false
+		}
+	case csilibplugins.AzureDiskInTreePluginName:
+		if !utilfeature.DefaultFeatureGate.Enabled(features.CSIMigrationAzureDisk) {
+			return false
+		}
+	case csilibplugins.CinderInTreePluginName:
+		if !utilfeature.DefaultFeatureGate.Enabled(features.CSIMigrationOpenStack) {
+			return false
+		}
+	default:
+		return false
+	}
+
+	// The plugin name should be listed in the CSINode object annotation.
+	// This indicates that the plugin has been migrated to a CSI driver in the node.
+	csiNodeAnn := csiNode.GetAnnotations()
+	if csiNodeAnn == nil {
+		return false
+	}
+
+	var mpaSet sets.String
+	mpa := csiNodeAnn[v1.MigratedPluginsAnnotationKey]
+	if len(mpa) == 0 {
+		mpaSet = sets.NewString()
+	} else {
+		tok := strings.Split(mpa, ",")
+		mpaSet = sets.NewString(tok...)
+	}
+
+	return mpaSet.Has(pluginName)
+}