cm metadata persist for rbd and cephfs

Gopkg.toml

@@ -33,3 +33,7 @@
 [[override]]
   name = "github.com/golang/protobuf"
   version = "1.1.0"
+
+[[constraint]]
+  name = "k8s.io/client-go"
+  version = "kubernetes-1.10.0-beta.1"

cephfs/main.go

@@ -22,6 +22,7 @@ import (
 	"path"
 
 	"github.com/ceph/ceph-csi/pkg/cephfs"
+	"github.com/ceph/ceph-csi/pkg/util"
 	"github.com/golang/glog"
 )
 
@@ -34,6 +35,7 @@ var (
 	driverName      = flag.String("drivername", "csi-cephfsplugin", "name of the driver")
 	nodeId          = flag.String("nodeid", "", "node id")
 	volumeMounter   = flag.String("volumemounter", "", "default volume mounter (possible options are 'kernel', 'fuse')")
+	metadataStorage = flag.String("metadatastorage", "", "metadata persistence method [node|k8s_configmap]")
 )
 
 func main() {
@@ -49,8 +51,14 @@ func main() {
 		os.Exit(1)
 	}
 
+	cp, err := util.NewCachePersister(*metadataStorage, *driverName)
+	if err != nil {
+		glog.Errorf("failed to define cache persistence method: %v", err)
+		os.Exit(1)
+	}
+
 	driver := cephfs.NewCephFSDriver()
-	driver.Run(*driverName, *nodeId, *endpoint, *volumeMounter)
+	driver.Run(*driverName, *nodeId, *endpoint, *volumeMounter, cp)
 
 	os.Exit(0)
 }

deploy/rbd/kubernetes/csi-rbdplugin.yaml

@@ -51,6 +51,7 @@ spec:
             - "--v=5"
             - "--drivername=csi-rbdplugin"
             - "--containerized=true"
+            - "--metadatastorage=node"
           env:
             - name: HOST_ROOTFS
               value: "/rootfs"
@@ -58,6 +59,10 @@ spec:
               valueFrom:
                 fieldRef:
                   fieldPath: spec.nodeName
+            - name: POD_NAMESPACE
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
             - name: CSI_ENDPOINT
               value: unix://var/lib/kubelet/plugins/csi-rbdplugin/csi.sock
           imagePullPolicy: "IfNotPresent"

docs/deploy-cephfs.md

@@ -27,6 +27,9 @@ Option | Default value | Description
 `--nodeid` | _empty_ | This node's ID
 `--volumemounter` | _empty_ | default volume mounter. Available options are `kernel` and `fuse`. This is the mount method used if volume parameters don't specify otherwise. If left unspecified, the driver will first probe for `ceph-fuse` in system's path and will choose Ceph kernel client if probing failed.
 
+**Available environmental variables:**
+`KUBERNETES_CONFIG_PATH`: if you use `k8s_configmap` as metadata store, specify the path of your k8s config file (if not specified, the plugin will assume you're running it inside a k8s cluster and find the config itself).
+
 **Available volume parameters:**
 
 Parameter | Required | Description

docs/deploy-rbd.md

@@ -26,11 +26,13 @@ Option | Default value | Description
 `--drivername` | `csi-cephfsplugin` | name of the driver (Kubernetes: `provisioner` field in StorageClass must correspond to this value)
 `--nodeid` | _empty_ | This node's ID
 `--containerized` | true | Whether running in containerized mode
-
+`--metadatastorage` | _empty_ | Whether should metadata be kept on node as file or in a k8s configmap (`node` or `k8s_configmap`)
 
 **Available environmental variables:**
 `HOST_ROOTFS`: rbdplugin searches `/proc` directory under the directory set by `HOST_ROOTFS`.
 
+`KUBERNETES_CONFIG_PATH`: if you use `k8s_configmap` as metadata store, specify the path of your k8s config file (if not specified, the plugin will assume you're running it inside a k8s cluster and find the config itself).
+
 **Available volume parameters:**
 
 Parameter | Required | Description

pkg/cephfs/controllercache.go

@@ -1,128 +0,0 @@
-/*
-Copyright 2018 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 cephfs
-
-import (
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"path"
-	"strings"
-	"sync"
-
-	"github.com/golang/glog"
-)
-
-const (
-	controllerCacheRoot = PluginFolder + "/controller/plugin-cache"
-)
-
-type controllerCacheEntry struct {
-	VolOptions volumeOptions
-	VolumeID   volumeID
-}
-
-type controllerCacheMap map[volumeID]*controllerCacheEntry
-
-var (
-	ctrCache    = make(controllerCacheMap)
-	ctrCacheMtx sync.Mutex
-)
-
-// Load all .json files from controllerCacheRoot into ctrCache
-// Called from driver.go's Run()
-func loadControllerCache() error {
-	cacheDir, err := ioutil.ReadDir(controllerCacheRoot)
-	if err != nil {
-		return fmt.Errorf("cannot read controller cache from %s: %v", controllerCacheRoot, err)
-	}
-
-	ctrCacheMtx.Lock()
-	defer ctrCacheMtx.Unlock()
-
-	for _, fi := range cacheDir {
-		if !strings.HasSuffix(fi.Name(), ".json") || !fi.Mode().IsRegular() {
-			continue
-		}
-
-		f, err := os.Open(path.Join(controllerCacheRoot, fi.Name()))
-		if err != nil {
-			glog.Errorf("cephfs: cloudn't read '%s' from controller cache: %v", fi.Name(), err)
-			continue
-		}
-
-		d := json.NewDecoder(f)
-		ent := &controllerCacheEntry{}
-
-		if err = d.Decode(ent); err != nil {
-			glog.Errorf("cephfs: failed to parse '%s': %v", fi.Name(), err)
-		} else {
-			ctrCache[ent.VolumeID] = ent
-		}
-
-		f.Close()
-	}
-
-	return nil
-}
-
-func getControllerCacheEntryPath(volId volumeID) string {
-	return path.Join(controllerCacheRoot, string(volId)+".json")
-}
-
-func (m controllerCacheMap) insert(ent *controllerCacheEntry) error {
-	filePath := getControllerCacheEntryPath(ent.VolumeID)
-
-	ctrCacheMtx.Lock()
-	defer ctrCacheMtx.Unlock()
-
-	f, err := os.Create(filePath)
-	if err != nil {
-		return fmt.Errorf("couldn't create cache entry file '%s': %v", filePath, err)
-	}
-	defer f.Close()
-
-	enc := json.NewEncoder(f)
-	if err = enc.Encode(ent); err != nil {
-		return fmt.Errorf("failed to encode cache entry for volume %s: %v", ent.VolumeID, err)
-	}
-
-	m[ent.VolumeID] = ent
-
-	return nil
-}
-
-func (m controllerCacheMap) pop(volId volumeID) (*controllerCacheEntry, error) {
-	ctrCacheMtx.Lock()
-	defer ctrCacheMtx.Unlock()
-
-	ent, ok := m[volId]
-	if !ok {
-		return nil, fmt.Errorf("cache entry for volume %s does not exist", volId)
-	}
-
-	filePath := getControllerCacheEntryPath(volId)
-
-	if err := os.Remove(filePath); err != nil {
-		return nil, fmt.Errorf("failed to remove cache entry file '%s': %v", filePath, err)
-	}
-
-	delete(m, volId)
-
-	return ent, nil
-}

pkg/cephfs/controllerserver.go

@@ -24,10 +24,18 @@ import (
 
 	"github.com/container-storage-interface/spec/lib/go/csi/v0"
 	"github.com/kubernetes-csi/drivers/pkg/csi-common"
+
+	"github.com/ceph/ceph-csi/pkg/util"
 )
 
 type controllerServer struct {
 	*csicommon.DefaultControllerServer
+	MetadataStore util.CachePersister
+}
+
+type controllerCacheEntry struct {
+	VolOptions volumeOptions
+	VolumeID   volumeID
 }
 
 func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest) (*csi.CreateVolumeResponse, error) {
@@ -35,7 +43,6 @@ func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
 		glog.Errorf("CreateVolumeRequest validation failed: %v", err)
 		return nil, err
 	}
-
 	// Configuration
 
 	volOptions, err := newVolumeOptions(req.GetParameters())
@@ -56,7 +63,6 @@ func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
 
 	if volOptions.ProvisionVolume {
 		// Admin credentials are required
-
 		cr, err := getAdminCredentials(req.GetControllerCreateSecrets())
 		if err != nil {
 			return nil, status.Error(codes.InvalidArgument, err.Error())
@@ -82,7 +88,8 @@ func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
 		glog.Infof("cephfs: volume %s is provisioned statically", volId)
 	}
 
-	if err = ctrCache.insert(&controllerCacheEntry{VolOptions: *volOptions, VolumeID: volId}); err != nil {
+	ce := &controllerCacheEntry{VolOptions: *volOptions, VolumeID: volId}
+	if err := cs.MetadataStore.Create(string(volId), ce); err != nil {
 		glog.Errorf("failed to store a cache entry for volume %s: %v", volId, err)
 		return nil, status.Error(codes.Internal, err.Error())
 	}
@@ -107,30 +114,18 @@ func (cs *controllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVol
 		err   error
 	)
 
-	// Load volume info from cache
+	ce := &controllerCacheEntry{}
-
+	if err := cs.MetadataStore.Get(string(volId), ce); err != nil {
-	ent, err := ctrCache.pop(volId)
-	if err != nil {
-		glog.Error(err)
 		return nil, status.Error(codes.Internal, err.Error())
 	}
 
-	if !ent.VolOptions.ProvisionVolume {
+	if !ce.VolOptions.ProvisionVolume {
 		// DeleteVolume() is forbidden for statically provisioned volumes!
 
 		glog.Warningf("volume %s is provisioned statically, aborting delete", volId)
 		return &csi.DeleteVolumeResponse{}, nil
 	}
 
-	defer func() {
-		if err != nil {
-			// Reinsert cache entry for retry
-			if insErr := ctrCache.insert(ent); insErr != nil {
-				glog.Errorf("failed to reinsert volume cache entry in rollback procedure for volume %s: %v", volId, err)
-			}
-		}
-	}()
-
 	// Deleting a volume requires admin credentials
 
 	cr, err := getAdminCredentials(req.GetControllerDeleteSecrets())
@@ -139,7 +134,7 @@ func (cs *controllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVol
 		return nil, status.Error(codes.InvalidArgument, err.Error())
 	}
 
-	if err = purgeVolume(volId, cr, &ent.VolOptions); err != nil {
+	if err = purgeVolume(volId, cr, &ce.VolOptions); err != nil {
 		glog.Errorf("failed to delete volume %s: %v", volId, err)
 		return nil, status.Error(codes.Internal, err.Error())
 	}
@@ -149,6 +144,10 @@ func (cs *controllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVol
 		return nil, status.Error(codes.Internal, err.Error())
 	}
 
+	if err := cs.MetadataStore.Delete(string(volId)); err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+
 	glog.Infof("cephfs: successfully deleted volume %s", volId)
 
 	return &csi.DeleteVolumeResponse{}, nil

pkg/cephfs/driver.go

@@ -17,12 +17,12 @@ limitations under the License.
 package cephfs
 
 import (
-	"os"
-
 	"github.com/golang/glog"
 
 	"github.com/container-storage-interface/spec/lib/go/csi/v0"
 	"github.com/kubernetes-csi/drivers/pkg/csi-common"
+
+	"github.com/ceph/ceph-csi/pkg/util"
 )
 
 const (
@@ -56,9 +56,10 @@ func NewIdentityServer(d *csicommon.CSIDriver) *identityServer {
 	}
 }
 
-func NewControllerServer(d *csicommon.CSIDriver) *controllerServer {
+func NewControllerServer(d *csicommon.CSIDriver, cachePersister util.CachePersister) *controllerServer {
 	return &controllerServer{
 		DefaultControllerServer: csicommon.NewDefaultControllerServer(d),
+		MetadataStore:           cachePersister,
 	}
 }
 
@@ -68,20 +69,11 @@ func NewNodeServer(d *csicommon.CSIDriver) *nodeServer {
 	}
 }
 
-func (fs *cephfsDriver) Run(driverName, nodeId, endpoint, volumeMounter string) {
+func (fs *cephfsDriver) Run(driverName, nodeId, endpoint, volumeMounter string, cachePersister util.CachePersister) {
 	glog.Infof("Driver: %v version: %v", driverName, Version)
 
 	// Configuration
 
-	if err := os.MkdirAll(controllerCacheRoot, 0755); err != nil {
-		glog.Fatalf("cephfs: failed to create %s: %v", controllerCacheRoot, err)
-		return
-	}
-
-	if err := loadControllerCache(); err != nil {
-		glog.Errorf("cephfs: failed to read volume cache: %v", err)
-	}
-
 	if err := loadAvailableMounters(); err != nil {
 		glog.Fatalf("cephfs: failed to load ceph mounters: %v", err)
 	}
@@ -120,7 +112,9 @@ func (fs *cephfsDriver) Run(driverName, nodeId, endpoint, volumeMounter string)
 
 	fs.is = NewIdentityServer(fs.driver)
 	fs.ns = NewNodeServer(fs.driver)
-	fs.cs = NewControllerServer(fs.driver)
+
+	fs.cs = NewControllerServer(fs.driver, cachePersister)
+	//fs.cs.LoadExDataFromMetadataStore()
 
 	server := csicommon.NewNonBlockingGRPCServer()
 	server.Start(endpoint, fs.is, fs.cs, fs.ns)

pkg/rbd/controllerserver.go

@@ -20,10 +20,10 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
-	"path"
 	"syscall"
 	"time"
 
+	"github.com/ceph/ceph-csi/pkg/util"
 	"github.com/container-storage-interface/spec/lib/go/csi/v0"
 	"github.com/golang/glog"
 	"github.com/kubernetes-csi/drivers/pkg/csi-common"
@@ -40,6 +40,28 @@ const (
 
 type controllerServer struct {
 	*csicommon.DefaultControllerServer
+	MetadataStore util.CachePersister
+}
+
+var (
+	rbdVolumes   = map[string]*rbdVolume{}
+	rbdSnapshots = map[string]*rbdSnapshot{}
+)
+
+func (cs *controllerServer) LoadExDataFromMetadataStore() error {
+	vol := &rbdVolume{}
+	cs.MetadataStore.ForAll("csi-rbd-vol-", vol, func(identifier string) error {
+		rbdVolumes[identifier] = vol
+		return nil
+	})
+
+	snap := &rbdSnapshot{}
+	cs.MetadataStore.ForAll("csi-rbd-(.*)-snap-", snap, func(identifier string) error {
+		rbdSnapshots[identifier] = snap
+		return nil
+	})
+	glog.Infof("Loaded %d volumes and %d snapshots from metadata store", len(rbdVolumes), len(rbdSnapshots))
+	return nil
 }
 
 func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest) (*csi.CreateVolumeResponse, error) {
@@ -92,7 +114,7 @@ func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
 		volName = rbdVol.Pool + "-dynamic-pvc-" + uniqueID
 	}
 	rbdVol.VolName = volName
-	volumeID := "csi-rbd-" + uniqueID
+	volumeID := "csi-rbd-vol-" + uniqueID
 	rbdVol.VolID = volumeID
 	// Volume Size - Default is 1 GiB
 	volSizeBytes := int64(oneGB)
@@ -118,7 +140,7 @@ func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
 			}
 
 			rbdSnap := &rbdSnapshot{}
-			if err := loadSnapInfo(snapshotID, path.Join(PluginFolder, "controller-snap"), rbdSnap); err != nil {
+			if err := cs.MetadataStore.Get(snapshotID, rbdSnap); err != nil {
 				return nil, err
 			}
 
@@ -137,11 +159,15 @@ func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
 			glog.V(4).Infof("create volume %s", volName)
 		}
 	}
-
+	if err := cs.MetadataStore.Create(volumeID, rbdVol); err != nil {
-	// Storing volInfo into a persistent file.
+		glog.Warningf("failed to store volume metadata with error: %v", err)
-	if err := persistVolInfo(volumeID, path.Join(PluginFolder, "controller"), rbdVol); err != nil {
+		if err := deleteRBDImage(rbdVol, rbdVol.AdminId, req.GetControllerCreateSecrets()); err != nil {
-		glog.Warningf("rbd: failed to store volInfo with error: %v", err)
+			glog.V(3).Infof("failed to delete rbd image: %s/%s with error: %v", rbdVol.Pool, rbdVol.VolName, err)
+			return nil, err
 		}
+		return nil, err
+	}
+
 	rbdVolumes[volumeID] = rbdVol
 	return &csi.CreateVolumeResponse{
 		Volume: &csi.Volume{
@@ -161,14 +187,15 @@ func (cs *controllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVol
 	volumeID := req.GetVolumeId()
 	volumeIDMutex.LockKey(volumeID)
 	defer volumeIDMutex.UnlockKey(volumeID)
+
 	rbdVol := &rbdVolume{}
-	if err := loadVolInfo(volumeID, path.Join(PluginFolder, "controller"), rbdVol); err != nil {
+	if err := cs.MetadataStore.Get(volumeID, rbdVol); err != nil {
 		if os.IsNotExist(errors.Cause(err)) {
-			// Must have been deleted already. This is not an error (idempotency!).
 			return &csi.DeleteVolumeResponse{}, nil
 		}
 		return nil, err
 	}
+
 	volName := rbdVol.VolName
 	// Deleting rbd image
 	glog.V(4).Infof("deleting volume %s", volName)
@@ -177,8 +204,8 @@ func (cs *controllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVol
 		glog.V(3).Infof("failed to delete rbd image: %s/%s with error: %v", rbdVol.Pool, volName, err)
 		return nil, err
 	}
-	// Removing persistent storage file for the unmapped volume
+
-	if err := deleteVolInfo(volumeID, path.Join(PluginFolder, "controller")); err != nil {
+	if err := cs.MetadataStore.Delete(volumeID); err != nil {
 		return nil, err
 	}
 
@@ -296,24 +323,21 @@ func (cs *controllerServer) CreateSnapshot(ctx context.Context, req *csi.CreateS
 
 	rbdSnap.CreatedAt = time.Now().UnixNano()
 
-	// Storing snapInfo into a persistent file.
+	if err := cs.MetadataStore.Create(snapshotID, rbdSnap); err != nil {
-	if err := persistSnapInfo(snapshotID, path.Join(PluginFolder, "controller-snap"), rbdSnap); err != nil {
 		glog.Warningf("rbd: failed to store snapInfo with error: %v", err)
-
 		// Unprotect snapshot
 		err := unprotectSnapshot(rbdSnap, rbdSnap.AdminId, req.GetCreateSnapshotSecrets())
 		if err != nil {
 			return nil, status.Error(codes.Unknown, fmt.Sprintf("This Snapshot should be removed but failed to unprotect snapshot: %s/%s with error: %v", rbdSnap.Pool, rbdSnap.SnapName, err))
 		}
-
 		// Deleting snapshot
 		glog.V(4).Infof("deleting Snaphot %s", rbdSnap.SnapName)
 		if err := deleteSnapshot(rbdSnap, rbdSnap.AdminId, req.GetCreateSnapshotSecrets()); err != nil {
 			return nil, status.Error(codes.Unknown, fmt.Sprintf("This Snapshot should be removed but failed to delete snapshot: %s/%s with error: %v", rbdSnap.Pool, rbdSnap.SnapName, err))
 		}
-
 		return nil, err
 	}
+
 	rbdSnapshots[snapshotID] = rbdSnap
 	return &csi.CreateSnapshotResponse{
 		Snapshot: &csi.Snapshot{
@@ -342,7 +366,7 @@ func (cs *controllerServer) DeleteSnapshot(ctx context.Context, req *csi.DeleteS
 	defer snapshotIDMutex.UnlockKey(snapshotID)
 
 	rbdSnap := &rbdSnapshot{}
-	if err := loadSnapInfo(snapshotID, path.Join(PluginFolder, "controller-snap"), rbdSnap); err != nil {
+	if err := cs.MetadataStore.Get(snapshotID, rbdSnap); err != nil {
 		return nil, err
 	}
 
@@ -358,8 +382,7 @@ func (cs *controllerServer) DeleteSnapshot(ctx context.Context, req *csi.DeleteS
 		return nil, status.Error(codes.FailedPrecondition, fmt.Sprintf("failed to delete snapshot: %s/%s with error: %v", rbdSnap.Pool, rbdSnap.SnapName, err))
 	}
 
-	// Removing persistent storage file for the unmapped snapshot
+	if err := cs.MetadataStore.Delete(snapshotID); err != nil {
-	if err := deleteSnapInfo(snapshotID, path.Join(PluginFolder, "controller-snap")); err != nil {
 		return nil, err
 	}
 

pkg/rbd/rbd.go

@@ -17,14 +17,9 @@ limitations under the License.
 package rbd
 
 import (
-	"encoding/json"
-	"io/ioutil"
-	"os"
-	"path"
-	"strings"
-
 	"github.com/golang/glog"
 
+	"github.com/ceph/ceph-csi/pkg/util"
 	"github.com/container-storage-interface/spec/lib/go/csi/v0"
 	"github.com/kubernetes-csi/drivers/pkg/csi-common"
 
@@ -56,94 +51,6 @@ var (
 	version   = "0.3.0"
 )
 
-var rbdVolumes map[string]*rbdVolume
-var rbdSnapshots map[string]*rbdSnapshot
-
-// Init checks for the persistent volume file and loads all found volumes
-// into a memory structure
-func init() {
-	rbdVolumes = map[string]*rbdVolume{}
-	rbdSnapshots = map[string]*rbdSnapshot{}
-	if _, err := os.Stat(path.Join(PluginFolder, "controller")); os.IsNotExist(err) {
-		glog.Infof("rbd: folder %s not found. Creating... \n", path.Join(PluginFolder, "controller"))
-		if err := os.Mkdir(path.Join(PluginFolder, "controller"), 0755); err != nil {
-			glog.Fatalf("Failed to create a controller's volumes folder with error: %v\n", err)
-		}
-	} else {
-		// Since "controller" folder exists, it means the rbdplugin has already been running, it means
-		// there might be some volumes left, they must be re-inserted into rbdVolumes map
-		loadExVolumes()
-	}
-	if _, err := os.Stat(path.Join(PluginFolder, "controller-snap")); os.IsNotExist(err) {
-		glog.Infof("rbd: folder %s not found. Creating... \n", path.Join(PluginFolder, "controller-snap"))
-		if err := os.Mkdir(path.Join(PluginFolder, "controller-snap"), 0755); err != nil {
-			glog.Fatalf("Failed to create a controller's snapshots folder with error: %v\n", err)
-		}
-	} else {
-		// Since "controller-snap" folder exists, it means the rbdplugin has already been running, it means
-		// there might be some snapshots left, they must be re-inserted into rbdSnapshots map
-		loadExSnapshots()
-	}
-}
-
-// loadExSnapshots check for any *.json files in the  PluginFolder/controller-snap folder
-// and loads then into rbdSnapshots map
-func loadExSnapshots() {
-	rbdSnap := rbdSnapshot{}
-	files, err := ioutil.ReadDir(path.Join(PluginFolder, "controller-snap"))
-	if err != nil {
-		glog.Infof("rbd: failed to read controller's snapshots folder: %s error:%v", path.Join(PluginFolder, "controller-snap"), err)
-		return
-	}
-	for _, f := range files {
-		if !strings.HasSuffix(f.Name(), ".json") {
-			continue
-		}
-		fp, err := os.Open(path.Join(PluginFolder, "controller-snap", f.Name()))
-		if err != nil {
-			glog.Infof("rbd: open file: %s err %%v", f.Name(), err)
-			continue
-		}
-		decoder := json.NewDecoder(fp)
-		if err = decoder.Decode(&rbdSnap); err != nil {
-			glog.Infof("rbd: decode file: %s err: %v", f.Name(), err)
-			fp.Close()
-			continue
-		}
-		rbdSnapshots[rbdSnap.SnapID] = &rbdSnap
-	}
-	glog.Infof("rbd: Loaded %d snapshots from %s", len(rbdSnapshots), path.Join(PluginFolder, "controller-snap"))
-}
-
-// loadExVolumes check for any *.json files in the  PluginFolder/controller folder
-// and loads then into rbdVolumes map
-func loadExVolumes() {
-	rbdVol := rbdVolume{}
-	files, err := ioutil.ReadDir(path.Join(PluginFolder, "controller"))
-	if err != nil {
-		glog.Infof("rbd: failed to read controller's volumes folder: %s error:%v", path.Join(PluginFolder, "controller"), err)
-		return
-	}
-	for _, f := range files {
-		if !strings.HasSuffix(f.Name(), ".json") {
-			continue
-		}
-		fp, err := os.Open(path.Join(PluginFolder, "controller", f.Name()))
-		if err != nil {
-			glog.Infof("rbd: open file: %s err %%v", f.Name(), err)
-			continue
-		}
-		decoder := json.NewDecoder(fp)
-		if err = decoder.Decode(&rbdVol); err != nil {
-			glog.Infof("rbd: decode file: %s err: %v", f.Name(), err)
-			fp.Close()
-			continue
-		}
-		rbdVolumes[rbdVol.VolID] = &rbdVol
-	}
-	glog.Infof("rbd: Loaded %d volumes from %s", len(rbdVolumes), path.Join(PluginFolder, "controller"))
-}
-
 func GetRBDDriver() *rbd {
 	return &rbd{}
 }
@@ -154,9 +61,10 @@ func NewIdentityServer(d *csicommon.CSIDriver) *identityServer {
 	}
 }
 
-func NewControllerServer(d *csicommon.CSIDriver) *controllerServer {
+func NewControllerServer(d *csicommon.CSIDriver, cachePersister util.CachePersister) *controllerServer {
 	return &controllerServer{
 		DefaultControllerServer: csicommon.NewDefaultControllerServer(d),
+		MetadataStore:           cachePersister,
 	}
 }
 
@@ -175,7 +83,7 @@ func NewNodeServer(d *csicommon.CSIDriver, containerized bool) (*nodeServer, err
 	}, nil
 }
 
-func (rbd *rbd) Run(driverName, nodeID, endpoint string, containerized bool) {
+func (rbd *rbd) Run(driverName, nodeID, endpoint string, containerized bool, cachePersister util.CachePersister) {
 	var err error
 	glog.Infof("Driver: %v version: %v", driverName, version)
 
@@ -198,7 +106,10 @@ func (rbd *rbd) Run(driverName, nodeID, endpoint string, containerized bool) {
 	if err != nil {
 		glog.Fatalln("failed to start node server, err %v", err)
 	}
-	rbd.cs = NewControllerServer(rbd.driver)
+
+	rbd.cs = NewControllerServer(rbd.driver, cachePersister)
+	rbd.cs.LoadExDataFromMetadataStore()
+
 	s := csicommon.NewNonBlockingGRPCServer()
 	s.Start(endpoint, rbd.ids, rbd.cs, rbd.ns)
 	s.Wait()

pkg/rbd/rbd_util.go

@@ -17,11 +17,8 @@ limitations under the License.
 package rbd
 
 import (
-	"encoding/json"
 	"fmt"
-	"os"
 	"os/exec"
-	"path"
 	"strings"
 	"time"
 
@@ -316,95 +313,6 @@ func hasSnapshotFeature(imageFeatures string) bool {
 	return false
 }
 
-func persistVolInfo(image string, persistentStoragePath string, volInfo *rbdVolume) error {
-	file := path.Join(persistentStoragePath, image+".json")
-	fp, err := os.Create(file)
-	if err != nil {
-		glog.Errorf("rbd: failed to create persistent storage file %s with error: %v\n", file, err)
-		return errors.Wrapf(err, "rbd: create error for %s", file)
-	}
-	defer fp.Close()
-	encoder := json.NewEncoder(fp)
-	if err = encoder.Encode(volInfo); err != nil {
-		glog.Errorf("rbd: failed to encode volInfo: %+v for file: %s with error: %v\n", volInfo, file, err)
-		return errors.Wrap(err, "rbd: encode error")
-	}
-	glog.Infof("rbd: successfully saved volInfo: %+v into file: %s\n", volInfo, file)
-	return nil
-}
-
-func loadVolInfo(image string, persistentStoragePath string, volInfo *rbdVolume) error {
-	file := path.Join(persistentStoragePath, image+".json")
-	fp, err := os.Open(file)
-	if err != nil {
-		return errors.Wrapf(err, "rbd: open error for %s", file)
-	}
-	defer fp.Close()
-
-	decoder := json.NewDecoder(fp)
-	if err = decoder.Decode(volInfo); err != nil {
-		return errors.Wrap(err, "rbd: decode error")
-	}
-
-	return nil
-}
-
-func deleteVolInfo(image string, persistentStoragePath string) error {
-	file := path.Join(persistentStoragePath, image+".json")
-	glog.Infof("rbd: Deleting file for Volume: %s at: %s resulting path: %+v\n", image, persistentStoragePath, file)
-	err := os.Remove(file)
-	if err != nil {
-		if err != os.ErrNotExist {
-			return errors.Wrapf(err, "rbd: error removing file %s", file)
-		}
-	}
-	return nil
-}
-
-func persistSnapInfo(snapshot string, persistentStoragePath string, snapInfo *rbdSnapshot) error {
-	file := path.Join(persistentStoragePath, snapshot+".json")
-	fp, err := os.Create(file)
-	if err != nil {
-		glog.Errorf("rbd: failed to create persistent storage file %s with error: %v\n", file, err)
-		return errors.Wrapf(err, "rbd: create error for %s", file)
-	}
-	defer fp.Close()
-	encoder := json.NewEncoder(fp)
-	if err = encoder.Encode(snapInfo); err != nil {
-		glog.Errorf("rbd: failed to encode snapInfo: %+v for file: %s with error: %v\n", snapInfo, file, err)
-		return errors.Wrap(err, "rbd: encode error")
-	}
-	glog.Infof("rbd: successfully saved snapInfo: %+v into file: %s\n", snapInfo, file)
-	return nil
-}
-
-func loadSnapInfo(snapshot string, persistentStoragePath string, snapInfo *rbdSnapshot) error {
-	file := path.Join(persistentStoragePath, snapshot+".json")
-	fp, err := os.Open(file)
-	if err != nil {
-		return errors.Wrapf(err, "rbd: open error for %s", file)
-	}
-	defer fp.Close()
-
-	decoder := json.NewDecoder(fp)
-	if err = decoder.Decode(snapInfo); err != nil {
-		return errors.Wrap(err, "rbd: decode error")
-	}
-	return nil
-}
-
-func deleteSnapInfo(snapshot string, persistentStoragePath string) error {
-	file := path.Join(persistentStoragePath, snapshot+".json")
-	glog.Infof("rbd: Deleting file for Snapshot: %s at: %s resulting path: %+v\n", snapshot, persistentStoragePath, file)
-	err := os.Remove(file)
-	if err != nil {
-		if err != os.ErrNotExist {
-			return errors.Wrapf(err, "rbd: error removing file %s", file)
-		}
-	}
-	return nil
-}
-
 func getRBDVolumeByID(volumeID string) (*rbdVolume, error) {
 	if rbdVol, ok := rbdVolumes[volumeID]; ok {
 		return rbdVol, nil

pkg/util/cachepersister.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2018 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 util
+
+import (
+	"errors"
+
+	"github.com/golang/glog"
+)
+
+const (
+	PluginFolder = "/var/lib/kubelet/plugins"
+)
+
+type ForAllFunc func(identifier string) error
+
+type CachePersister interface {
+	Create(identifier string, data interface{}) error
+	Get(identifier string, data interface{}) error
+	ForAll(pattern string, destObj interface{}, f ForAllFunc) error
+	Delete(identifier string) error
+}
+
+func NewCachePersister(metadataStore string, driverName string) (CachePersister, error) {
+	if metadataStore == "k8s_configmap" {
+		glog.Infof("cache-perister: using kubernetes configmap as metadata cache persister")
+		k8scm := &K8sCMCache{}
+		k8scm.Client = NewK8sClient()
+		k8scm.Namespace = GetK8sNamespace()
+		return k8scm, nil
+	} else if metadataStore == "node" {
+		glog.Infof("cache-persister: using node as metadata cache persister")
+		nc := &NodeCache{}
+		nc.BasePath = PluginFolder + "/" + driverName
+		return nc, nil
+	}
+	return nil, errors.New("cache-persister: couldn't parse metadatastorage flag")
+}

pkg/util/k8scmcache.go

@@ -0,0 +1,172 @@
+/*
+Copyright 2018 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 util
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"regexp"
+
+	"github.com/golang/glog"
+	"github.com/pkg/errors"
+
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	k8s "k8s.io/client-go/kubernetes"
+	apierrs "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+type K8sCMCache struct {
+	Client    *k8s.Clientset
+	Namespace string
+}
+
+const (
+	defaultNamespace = "default"
+
+	cmLabel   = "csi-metadata"
+	cmDataKey = "content"
+
+	csiMetadataLabelAttr = "com.ceph.ceph-csi/metadata"
+)
+
+func GetK8sNamespace() string {
+	namespace := os.Getenv("POD_NAMESPACE")
+	if namespace == "" {
+		return defaultNamespace
+	}
+	return namespace
+}
+
+func NewK8sClient() *k8s.Clientset {
+	var cfg *rest.Config
+	var err error
+	cPath := os.Getenv("KUBERNETES_CONFIG_PATH")
+	if cPath != "" {
+		cfg, err = clientcmd.BuildConfigFromFlags("", cPath)
+		if err != nil {
+			glog.Errorf("Failed to get cluster config with error: %v\n", err)
+			os.Exit(1)
+		}
+	} else {
+		cfg, err = rest.InClusterConfig()
+		if err != nil {
+			glog.Errorf("Failed to get cluster config with error: %v\n", err)
+			os.Exit(1)
+		}
+	}
+	client, err := k8s.NewForConfig(cfg)
+	if err != nil {
+		glog.Errorf("Failed to create client with error: %v\n", err)
+		os.Exit(1)
+	}
+	return client
+}
+
+func (k8scm *K8sCMCache) getMetadataCM(resourceID string) (*v1.ConfigMap, error) {
+	cm, err := k8scm.Client.CoreV1().ConfigMaps(k8scm.Namespace).Get(resourceID, metav1.GetOptions{})
+	if err != nil {
+		return nil, err
+	}
+	return cm, nil
+}
+
+func (k8scm *K8sCMCache) ForAll(pattern string, destObj interface{}, f ForAllFunc) error {
+	listOpts := metav1.ListOptions{LabelSelector: fmt.Sprintf("%s=%s", csiMetadataLabelAttr, cmLabel)}
+	cms, err := k8scm.Client.CoreV1().ConfigMaps(k8scm.Namespace).List(listOpts)
+	if err != nil {
+		return errors.Wrap(err, "k8s-cm-cache: failed to list metadata configmaps")
+	}
+
+	for _, cm := range cms.Items {
+		data := cm.Data[cmDataKey]
+		match, err := regexp.MatchString(pattern, cm.ObjectMeta.Name)
+		if err != nil {
+			continue
+		}
+		if !match {
+			continue
+		}
+		if err := json.Unmarshal([]byte(data), destObj); err != nil {
+			return errors.Wrap(err, "k8s-cm-cache: unmarshal error")
+		}
+		if err = f(cm.ObjectMeta.Name); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (k8scm *K8sCMCache) Create(identifier string, data interface{}) error {
+	cm, err := k8scm.getMetadataCM(identifier)
+	if cm != nil && err == nil {
+		glog.V(4).Infof("k8s-cm-cache: configmap already exists, skipping configmap creation")
+		return nil
+	} else {
+		dataJson, err := json.Marshal(data)
+		if err != nil {
+			return errors.Wrap(err, "k8s-cm-cache: marshal error")
+		}
+		cm := &v1.ConfigMap{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      identifier,
+				Namespace: k8scm.Namespace,
+				Labels: map[string]string{
+					csiMetadataLabelAttr: cmLabel,
+				},
+			},
+			Data: map[string]string{},
+		}
+		cm.Data[cmDataKey] = string(dataJson)
+
+		_, err = k8scm.Client.CoreV1().ConfigMaps(k8scm.Namespace).Create(cm)
+		if err != nil {
+			if apierrs.IsAlreadyExists(err) {
+				glog.V(4).Infof("k8s-cm-cache: configmap already exists")
+				return nil
+			}
+			return errors.Wrapf(err, "k8s-cm-cache: couldn't persist %s metadata as configmap", identifier)
+		}
+
+	}
+	glog.V(4).Infof("k8s-cm-cache: configmap %s successfully created\n", identifier)
+	return nil
+}
+
+func (k8scm *K8sCMCache) Get(identifier string, data interface{}) error {
+	cm, err := k8scm.getMetadataCM(identifier)
+	if err != nil {
+		return err
+	}
+	err = json.Unmarshal([]byte(cm.Data[cmDataKey]), data)
+	if err != nil {
+		return errors.Wrap(err, "k8s-cm-cache: unmarshal error")
+	}
+	return nil
+}
+
+func (k8scm *K8sCMCache) Delete(identifier string) error {
+	err := k8scm.Client.CoreV1().ConfigMaps(k8scm.Namespace).Delete(identifier, nil)
+	if err != nil {
+		return errors.Wrapf(err, "k8s-cm-cache: couldn't delete metadata configmap %s", identifier)
+	}
+	glog.V(4).Infof("k8s-cm-cache: successfully deleted metadata configmap %s", identifier)
+	return nil
+}

pkg/util/nodecache.go

@@ -0,0 +1,124 @@
+/*
+Copyright 2018 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 util
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"github.com/golang/glog"
+	"github.com/pkg/errors"
+)
+
+type NodeCache struct {
+	BasePath string
+}
+
+var cacheDir = "controller"
+
+func (nc *NodeCache) EnsureCacheDirectory(cacheDir string) error {
+	fullPath := path.Join(nc.BasePath, cacheDir)
+	if _, err := os.Stat(fullPath); os.IsNotExist(err) {
+		if err := os.Mkdir(fullPath, 0755); err != nil {
+			return errors.Wrapf(err, "node-cache: failed to create %s folder with error: %v", fullPath, err)
+		}
+	}
+	return nil
+}
+
+func (nc *NodeCache) ForAll(pattern string, destObj interface{}, f ForAllFunc) error {
+	err := nc.EnsureCacheDirectory(cacheDir)
+	if err != nil {
+		return errors.Wrap(err, "node-cache: couldn't ensure cache directory exists")
+	}
+	files, err := ioutil.ReadDir(path.Join(nc.BasePath, cacheDir))
+	if err != nil {
+		return errors.Wrapf(err, "node-cache: failed to read %s folder", nc.BasePath)
+	}
+
+	for _, file := range files {
+		match, err := regexp.MatchString(pattern, file.Name())
+		if err != nil || !match {
+			continue
+		}
+		if !strings.HasSuffix(file.Name(), ".json") {
+			continue
+		}
+		fp, err := os.Open(path.Join(nc.BasePath, cacheDir, file.Name()))
+		if err != nil {
+			glog.Infof("node-cache: open file: %s err %%v", file.Name(), err)
+			continue
+		}
+		decoder := json.NewDecoder(fp)
+		if err = decoder.Decode(destObj); err != nil {
+			fp.Close()
+			return errors.Wrapf(err, "node-cache: couldn't decode file %s", file.Name())
+		}
+		if err := f(strings.TrimSuffix(file.Name(), filepath.Ext(file.Name()))); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (nc *NodeCache) Create(identifier string, data interface{}) error {
+	file := path.Join(nc.BasePath, cacheDir, identifier+".json")
+	fp, err := os.Create(file)
+	if err != nil {
+		return errors.Wrapf(err, "node-cache: failed to create metadata storage file %s\n", file)
+	}
+	defer fp.Close()
+	encoder := json.NewEncoder(fp)
+	if err = encoder.Encode(data); err != nil {
+		return errors.Wrapf(err, "node-cache: failed to encode metadata for file: %s\n", file)
+	}
+	glog.V(4).Infof("node-cache: successfully saved metadata into file: %s\n", file)
+	return nil
+}
+
+func (nc *NodeCache) Get(identifier string, data interface{}) error {
+	file := path.Join(nc.BasePath, cacheDir, identifier+".json")
+	fp, err := os.Open(file)
+	if err != nil {
+		return errors.Wrapf(err, "node-cache: open error for %s", file)
+	}
+	defer fp.Close()
+
+	decoder := json.NewDecoder(fp)
+	if err = decoder.Decode(data); err != nil {
+		return errors.Wrap(err, "rbd: decode error")
+	}
+
+	return nil
+}
+
+func (nc *NodeCache) Delete(identifier string) error {
+	file := path.Join(nc.BasePath, cacheDir, identifier+".json")
+	err := os.Remove(file)
+	if err != nil {
+		if err != os.ErrNotExist {
+			return errors.Wrapf(err, "node-cache: error removing file %s", file)
+		}
+	}
+	glog.V(4).Infof("node-cache: successfully deleted metadata storage file at: %+v\n", file)
+	return nil
+}

rbd/main.go

@@ -22,6 +22,7 @@ import (
 	"path"
 
 	"github.com/ceph/ceph-csi/pkg/rbd"
+	"github.com/ceph/ceph-csi/pkg/util"
 	"github.com/golang/glog"
 )
 
@@ -34,6 +35,7 @@ var (
 	driverName      = flag.String("drivername", "csi-rbdplugin", "name of the driver")
 	nodeID          = flag.String("nodeid", "", "node id")
 	containerized   = flag.Bool("containerized", true, "whether run as containerized")
+	metadataStorage = flag.String("metadatastorage", "", "metadata persistence method [node|k8s_configmap]")
 )
 
 func main() {
@@ -48,13 +50,16 @@ func main() {
 		os.Exit(1)
 	}
 
-	handle()
+	cp, err := util.NewCachePersister(*metadataStorage, *driverName)
-	os.Exit(0)
+	if err != nil {
-}
+		glog.Errorf("failed to define cache persistence method: %v", err)
+		os.Exit(1)
+	}
 
-func handle() {
 	driver := rbd.GetRBDDriver()
-	driver.Run(*driverName, *nodeID, *endpoint, *containerized)
+	driver.Run(*driverName, *nodeID, *endpoint, *containerized, cp)
+
+	os.Exit(0)
 }
 
 func createPersistentStorage(persistentStoragePath string) error {