Add FSType for CSI volume source

pkg/apis/core/types.go

@@ -1615,6 +1615,12 @@ type CSIPersistentVolumeSource struct {
 	// Defaults to false (read/write).
 	// +optional
 	ReadOnly bool
+
+	// Filesystem type to mount.
+	// Must be a filesystem type supported by the host operating system.
+	// Ex. "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.
+	// +optional
+	FSType string
 }
 
 // ContainerPort represents a network port in a single container

pkg/volume/csi/csi_mounter.go

@@ -34,6 +34,8 @@ import (
 	"k8s.io/kubernetes/pkg/volume/util"
 )
 
+const defaultFSType = "ext4"
+
 //TODO (vladimirvivien) move this in a central loc later
 var (
 	volDataKey = struct {
@@ -189,6 +191,11 @@ func (c *csiMountMgr) SetUpAt(dir string, fsGroup *int64) error {
 		accessMode = c.spec.PersistentVolume.Spec.AccessModes[0]
 	}
 
+	fsType := csiSource.FSType
+	if len(fsType) == 0 {
+		fsType = defaultFSType
+	}
+
 	err = csi.NodePublishVolume(
 		ctx,
 		c.volumeID,
@@ -197,7 +204,7 @@ func (c *csiMountMgr) SetUpAt(dir string, fsGroup *int64) error {
 		accessMode,
 		c.volumeInfo,
 		attribs,
-		"ext4", //TODO needs to be sourced from PV or somewhere else
+		fsType,
 	)
 
 	if err != nil {

staging/src/k8s.io/api/core/v1/types.go

@@ -1730,6 +1730,12 @@ type CSIPersistentVolumeSource struct {
 	// Defaults to false (read/write).
 	// +optional
 	ReadOnly bool `json:"readOnly,omitempty" protobuf:"varint,3,opt,name=readOnly"`
+
+	// Filesystem type to mount.
+	// Must be a filesystem type supported by the host operating system.
+	// Ex. "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.
+	// +optional
+	FSType string `json:"fsType,omitempty" protobuf:"bytes,4,opt,name=fsType"`
 }
 
 // ContainerPort represents a network port in a single container.