Unity: unexpected data in share from snapshot

The share created from snapshot had inconsistent data with the snapshot,
but consistent with the original share. Because the snapshot was
created on wrong `storage resource`.

Change-Id: Ia135c93bd9eedaba549426ea9233a90767de5d46
Closes-bug: 1701458

manila/share/drivers/dell_emc/plugins/unity/client.py

@@ -210,18 +210,14 @@ class UnityClient(object):
             LOG.info('Snapshot %(snap)s on Filesystem %(fs)s already '
                      'exists.', {'snap': name, 'fs': filesystem.name})
 
-    def create_snap_of_snap(self, src_snap, dst_snap_name, snap_type):
-        access_type = enums.FilesystemSnapAccessTypeEnum.PROTOCOL
-        if snap_type == 'checkpoint':
-            access_type = enums.FilesystemSnapAccessTypeEnum.CHECKPOINT
-
+    def create_snap_of_snap(self, src_snap, dst_snap_name):
         if isinstance(src_snap, six.string_types):
             snap = self.get_snapshot(name=src_snap)
         else:
             snap = src_snap
 
         try:
-            return snap.create_snap(dst_snap_name, fs_access_type=access_type)
+            return snap.create_snap(dst_snap_name)
         except storops_ex.UnitySnapNameInUseError:
             return self.get_snapshot(dst_snap_name)
 

manila/share/drivers/dell_emc/plugins/unity/connection.py

@@ -213,8 +213,7 @@ class UnityStorageConnection(driver.StorageConnection):
             raise exception.EMCUnityError(err=message)
 
         backend_snap = self.client.create_snap_of_snap(snapshot['id'],
-                                                       share_name,
-                                                       snap_type='snapshot')
+                                                       share_name)
 
         locations = None
         if share_proto == 'CIFS':
@@ -274,9 +273,7 @@ class UnityStorageConnection(driver.StorageConnection):
 
         snapshot_name = snapshot['id']
         if self._is_share_from_snapshot(backend_share):
-            self.client.create_snap_of_snap(backend_share.snap,
-                                            snapshot_name,
-                                            snap_type='checkpoint')
+            self.client.create_snap_of_snap(backend_share.snap, snapshot_name)
         else:
             self.client.create_snapshot(backend_share.filesystem,
                                         snapshot_name)

manila/tests/share/drivers/dell_emc/plugins/unity/test_client.py

@@ -148,8 +148,7 @@ class TestClient(test.TestCase):
         snapshot = mocked_input['src_snapshot']
         dest_snap = mocked_input['dest_snapshot']
 
-        new_snap = client.create_snap_of_snap(
-            snapshot, dest_snap.name, 'checkpoint')
+        new_snap = client.create_snap_of_snap(snapshot, dest_snap.name)
 
         self.assertEqual(dest_snap.name, new_snap.name)
 

releasenotes/notes/unexpected-data-of-share-from-snap-134189fc0f3eeedf.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - Fixed bug in Dell EMC Unity driver that caused shares created from
+    snapshots to contain data from the original shares, instead of data from
+    their snapshots.