Removed config maps and replaced with rados omaps

Existing config maps are now replaced with rados omaps that help
store information regarding the requested volume names and the rbd
image names backing the same.

Further to detect cluster, pool and which image a volume ID refers
to, changes to volume ID encoding has been done as per provided
design specification in the stateless ceph-csi proposal.

Additional changes and updates,
- Updated documentation
- Updated manifests
- Updated Helm chart
- Addressed a few csi-test failures

Signed-off-by: ShyamsundarR <srangana@redhat.com>

pkg/cephfs/cephconf.go

@@ -1,48 +0,0 @@
-/*
-Copyright 2018 The Ceph-CSI 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 (
-	"io/ioutil"
-	"os"
-)
-
-var cephConfig = []byte(`[global]
-auth_cluster_required = cephx
-auth_service_required = cephx
-auth_client_required = cephx
-
-# Workaround for http://tracker.ceph.com/issues/23446
-fuse_set_user_groups = false
-`)
-
-const (
-	cephConfigRoot = "/etc/ceph"
-	cephConfigPath = "/etc/ceph/ceph.conf"
-)
-
-func createCephConfigRoot() error {
-	return os.MkdirAll(cephConfigRoot, 0755) // #nosec
-}
-
-func writeCephConfig() error {
-	if err := createCephConfigRoot(); err != nil {
-		return err
-	}
-
-	return ioutil.WriteFile(cephConfigPath, cephConfig, 0640)
-}

pkg/cephfs/cephuser.go

@@ -18,6 +18,8 @@ package cephfs
 
 import (
 	"fmt"
+
+	"github.com/ceph/ceph-csi/pkg/util"
 )
 
 const (
@@ -72,7 +74,7 @@ func getCephUser(volOptions *volumeOptions, adminCr *credentials, volID volumeID
 		"-m", volOptions.Monitors,
 		"-n", adminID,
 		"--key="+adminCr.key,
-		"-c", cephConfigPath,
+		"-c", util.CephConfigPath,
 		"-f", "json",
 		"auth", "get", userID,
 	)
@@ -85,7 +87,7 @@ func createCephUser(volOptions *volumeOptions, adminCr *credentials, volID volum
 		"-m", volOptions.Monitors,
 		"-n", adminID,
 		"--key="+adminCr.key,
-		"-c", cephConfigPath,
+		"-c", util.CephConfigPath,
 		"-f", "json",
 		"auth", "get-or-create", userID,
 		// User capabilities
@@ -102,7 +104,7 @@ func deleteCephUser(volOptions *volumeOptions, adminCr *credentials, volID volum
 		"-m", volOptions.Monitors,
 		"-n", adminID,
 		"--key="+adminCr.key,
-		"-c", cephConfigPath,
+		"-c", util.CephConfigPath,
 		"auth", "rm", userID,
 	)
 }

pkg/cephfs/driver.go

@@ -101,7 +101,7 @@ func (fs *Driver) Run(driverName, nodeID, endpoint, volumeMounter, mountCacheDir
 
 	klog.Infof("cephfs: setting default volume mounter to %s", DefaultVolumeMounter)
 
-	if err := writeCephConfig(); err != nil {
+	if err := util.WriteCephConfig(); err != nil {
 		klog.Fatalf("failed to write ceph configuration file: %v", err)
 	}
 

pkg/cephfs/volumemounter.go

@@ -25,6 +25,8 @@ import (
 	"strconv"
 	"sync"
 
+	"github.com/ceph/ceph-csi/pkg/util"
+
 	"k8s.io/klog"
 )
 
@@ -115,7 +117,7 @@ func mountFuse(mountPoint string, cr *credentials, volOptions *volumeOptions) er
 	args := [...]string{
 		mountPoint,
 		"-m", volOptions.Monitors,
-		"-c", cephConfigPath,
+		"-c", util.CephConfigPath,
 		"-n", cephEntityClientPrefix + cr.id, "--key=" + cr.key,
 		"-r", volOptions.RootPath,
 		"-o", "nonempty",