rook-ceph: Change the FS type to ext4
This commit changes the default file system type to `ext4` from `xfs`.
The rook documentation cautions:
> `xfs` is not recommended due to potential deadlock in hyperconverged
> settings where the volume is mounted on the same node as the osds.
@@ -169,7 +169,7 @@ parameters:
# Specify the filesystem type of the volume. If not specified, csi-provisioner
# will set default as 'ext4'.
- csi.storage.k8s.io/fstype: xfs
+ csi.storage.k8s.io/fstype: ext4
# Delete the rbd volume when a PVC is deleted
reclaimPolicy: {{ .StorageClass.ReclaimPolicy }}
