qcow2util: use tap-ctl to identify tapdisk for a path

Signed-off-by: Damien Thenot <damien.thenot@vates.tech>

Author: Nambrok

drivers/qcow2util.py

@@ -713,14 +713,11 @@ def _getTapdisk(self, path: str) -> Tuple[int, int]:
         """
         Return a tuple of (PID, Minor) for the given path
         """
-        pid_openers = util.get_openers_pid(path)
-        if pid_openers:
-            if len(pid_openers) > 1:
-                raise xs_errors.XenError("Multiple openers for {}".format(path)) # TODO: There might be multiple PID? Yes, we can have the chain enabled for multiple leaf (i.e. after a clone), taken into account in cleanup.py
-            pid = pid_openers[0]
-            tapdiskList = TapCtl.list(pid=pid)
-            if len(tapdiskList) > 1: #TODO: There might more than one minor for this blktap?
+        tapdiskList = TapCtl.list(path=path) #TODO: do we want to use realpath here to have the whole path?
+        if tapdiskList:
+            if len(tapdiskList) > 1: #TODO: There might more than one minor or pid for this path?
                 raise xs_errors.XenError("TapdiskAlreadyRunning", "There is multiple minor for this tapdisk process")
+            pid = tapdiskList[0]["pid"]
             minor = tapdiskList[0]["minor"]
             return (pid, minor)
         raise xs_errors.XenError("TapdiskFailed", "No tapdisk process found for {}".format(path))