--- /dev/null
+#!/bin/sh -x
+
+expect_failure() {
+ if "$@"; then return 1; else return 0; fi
+}
+set -e
+
+ceph mds set allow_new_snaps false
+expect_failure mkdir .snap/foo
+ceph mds set allow_new_snaps true --yes-i-really-mean-it
+
+echo asdf > foo
+mkdir .snap/foo
+grep asdf .snap/foo/foo
+rmdir .snap/foo
+
+echo asdf > bar
+mkdir .snap/bar
+rm bar
+grep asdf .snap/bar/bar
+rmdir .snap/bar
+rm foo
+
+ceph mds set allow_new_snaps false
+expect_failure mkdir .snap/baz
+
+echo OK