fix(blktap2.py): change chain check position to be after lvchange lock

Signed-off-by: Damien Thenot <[email protected]>

Author: Nambrok

drivers/blktap2.py

@@ -1773,8 +1773,6 @@ def _activate_locked(self, sr_uuid, vdi_uuid, options):
 
             vdi_type = self.target.get_vdi_type()
 
-            self._check_journal_coalesce_chain(sr_uuid, vdi_uuid)
-            #TODO: handling error here
 
             # Take lvchange-p Lock before running
             # tap-ctl open
@@ -1787,6 +1785,9 @@ def _activate_locked(self, sr_uuid, vdi_uuid, options):
                 lock = Lock("lvchange-p", NS_PREFIX_LVM + sr_uuid)
                 lock.acquire()
 
+            self._check_journal_coalesce_chain(sr_uuid, vdi_uuid)
+            #TODO: handling error here
+
             # When we attach a static VDI for HA, we cannot communicate with
             # xapi, because has not started yet. These VDIs are raw.
             if VdiType.isCowImage(vdi_type):