--- /dev/null
+#!/bin/sh
+
+set -e
+
+mkdir x
+cd x
+touch a
+touch b
+touch c
+touch d
+ls
+chmod 777 .
+stat e || true
+touch f
+touch g
+
+# over existing file
+echo attempting rename over existing file...
+touch ../xx
+mv ../xx f
+ls | grep f || false
+echo rename over existing file is okay
+
+# over negative dentry
+echo attempting rename over negative dentry...
+touch ../xx
+mv ../xx e
+ls | grep e || false
+echo rename over negative dentry is ok
+
+echo OK