Add mount option for Cephfs

The storage class already takes MountOptions(MountFlags), these are the
bind mount options. Some of these options may not be recognised by the
cephfs mount. Hence added a new parameterin Storage Class for
- cephfs kernel mount options,
- ceph-fuse mount options

Ceph kernel mount options are different from ceph-fuse options, hence
added two different parameters.

Signed-off-by: Poornima G <pgurusid@redhat.com>

docs/deploy-cephfs.md

@@ -78,6 +78,8 @@ is used to define in which namespace you want the configmaps to be stored
 | `fsName`                                                                                            | yes            | CephFS filesystem name into which the volume shall be created                                                                                                                                                           |
 | `mounter`                                                                                           | no             | Mount method to be used for this volume. Available options are `kernel` for Ceph kernel client and `fuse` for Ceph FUSE driver. Defaults to "default mounter".                                                          |
 | `pool`                                                                                              | no             | Ceph pool into which volume data shall be stored                                                                                                                                                                        |
+| `kernelMountOptions`                                                                                | no             | Comma separated string of mount options accepted by cephfs kernel mounter, by default no options are passed. Check man mount.ceph for options.                                                                          |
+| `fuseMountOptions`                                                                                  | no             | Comma separated string of mount options accepted by ceph-fuse mounter, by default no options are passed.                                                                                                                |
 | `csi.storage.k8s.io/provisioner-secret-name`, `csi.storage.k8s.io/node-stage-secret-name`           | for Kubernetes | Name of the Kubernetes Secret object containing Ceph client credentials. Both parameters should have the same value                                                                                                     |
 | `csi.storage.k8s.io/provisioner-secret-namespace`, `csi.storage.k8s.io/node-stage-secret-namespace` | for Kubernetes | Namespaces of the above Secret objects                                                                                                                                                                                  |
 

examples/cephfs/storageclass.yaml

@@ -20,6 +20,14 @@ parameters:
   # (optional) Ceph pool into which volume data shall be stored
   # pool: cephfs_data
 
+  # (optional) Comma separated string of Ceph-fuse mount options.
+  # For eg:
+  # fuseMountOptions: debug
+
+  # (optional) Comma separated string of Cephfs kernel mount options.
+  # Check man mount.ceph for mount options. For eg:
+  # kernelMountOptions: readdir_max_bytes=1048576,norbytes
+
   # The secrets have to contain user and/or Ceph admin credentials.
   csi.storage.k8s.io/provisioner-secret-name: csi-cephfs-secret
   csi.storage.k8s.io/provisioner-secret-namespace: default

pkg/cephfs/volumemounter.go

@@ -141,6 +141,9 @@ func mountFuse(ctx context.Context, mountPoint string, cr *util.Credentials, vol
 		"-o", "nonempty",
 	}
 
+	if volOptions.FuseMountOptions != "" {
+		args = append(args, ","+volOptions.FuseMountOptions)
+	}
 	if volOptions.FsName != "" {
 		args = append(args, "--client_mds_namespace="+volOptions.FsName)
 	}
@@ -197,6 +200,9 @@ func mountKernel(ctx context.Context, mountPoint string, cr *util.Credentials, v
 	if volOptions.FsName != "" {
 		optionsStr += fmt.Sprintf(",mds_namespace=%s", volOptions.FsName)
 	}
+	if volOptions.KernelMountOptions != "" {
+		optionsStr += fmt.Sprintf(",%s", volOptions.KernelMountOptions)
+	}
 	args = append(args, "-o", optionsStr)
 
 	return execCommandErr(ctx, "mount", args[:]...)

pkg/cephfs/volumeoptions.go

@@ -38,6 +38,8 @@ type volumeOptions struct {
 	RootPath           string `json:"rootPath"`
 	Mounter            string `json:"mounter"`
 	ProvisionVolume    bool   `json:"provisionVolume"`
+	KernelMountOptions string `json:"kernelMountOptions"`
+	FuseMountOptions   string `json:"fuseMountOptions"`
 }
 
 func validateNonEmptyField(field, fieldName string) error {
@@ -147,6 +149,14 @@ func newVolumeOptions(ctx context.Context, requestName string, size int64, volOp
 		return nil, err
 	}
 
+	if err = extractOptionalOption(&opts.KernelMountOptions, "kernelMountOptions", volOptions); err != nil {
+		return nil, err
+	}
+
+	if err = extractOptionalOption(&opts.FuseMountOptions, "fuseMountOptions", volOptions); err != nil {
+		return nil, err
+	}
+
 	opts.RequestName = requestName
 	opts.Size = size
 
@@ -223,6 +233,14 @@ func newVolumeOptionsFromVolID(ctx context.Context, volID string, volOpt, secret
 			return nil, nil, err
 		}
 
+		if err = extractOptionalOption(&volOptions.KernelMountOptions, "kernelMountOptions", volOpt); err != nil {
+			return nil, nil, err
+		}
+
+		if err = extractOptionalOption(&volOptions.FuseMountOptions, "fuseMountOptions", volOpt); err != nil {
+			return nil, nil, err
+		}
+
 		if err = extractMounter(&volOptions.Mounter, volOpt); err != nil {
 			return nil, nil, err
 		}