Add the ability to extend FC vscsi volumes

The compute host does not need to do anything for the client to
see the extended size.

Change-Id: I56582d9e8846e319d9875b05fe2cd313c1a12c8d

doc/source/support-matrix.ini

@@ -113,7 +113,7 @@ notes=The extend volume operation provides a means to extend
   Therefore this operation is not considered to be mandatory to support.
 cli=cinder extend <volume> <new_size>
 driver-impl-powervm=partial
-driver-notes-powervm=Only supported for NPIV, FileIO, and iSCSI volumes.
+driver-notes-powervm=Not supported for rbd volumes.
 
 [operation.attach-interface]
 title=Attach virtual network interface to instance

nova_powervm/tests/virt/powervm/volume/test_vscsi.py

@@ -1,4 +1,4 @@
-# Copyright 2015, 2017 IBM Corp.
+# Copyright 2015, 2018 IBM Corp.
 #
 # All Rights Reserved.
 #
@@ -290,6 +290,10 @@ class TestVSCSIAdapter(BaseVSCSITest):
         self.assertRaises(p_exc.VolumeAttachFailed,
                           self.vol_drv._validate_vios_on_connection, 1)
 
+    def test_extend_volume(self):
+        # Ensure the method is implemented
+        self.vol_drv.extend_volume()
+
     @mock.patch('pypowervm.tasks.hdisk.remove_hdisk')
     @mock.patch('pypowervm.wrappers.virtual_io_server.VIOS.hdisk_from_uuid')
     @mock.patch('pypowervm.tasks.scsi_mapper.remove_maps')

nova_powervm/virt/powervm/volume/vscsi.py

@@ -1,4 +1,4 @@
-# Copyright 2015, 2017 IBM Corp.
+# Copyright 2015, 2018 IBM Corp.
 #
 # All Rights Reserved.
 #
@@ -163,6 +163,11 @@ class PVVscsiFCVolumeAdapter(volume.VscsiVolumeAdapter,
             vios_w, self.volume_id)
         return hdisk.good_discovery(status, device_name), udid
 
+    def extend_volume(self):
+        # The compute node does not need to take any additional steps for the
+        # client to see the extended volume.
+        pass
+
     def _discover_volume_on_vios(self, vios_w, volume_id):
         """Discovers an hdisk on a single vios for the volume.