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diff --git a/src/ceph/qa/tasks/cephfs/test_mantle.py b/src/ceph/qa/tasks/cephfs/test_mantle.py
new file mode 100644
index 0000000..6cd86ad
--- /dev/null
+++ b/src/ceph/qa/tasks/cephfs/test_mantle.py
@@ -0,0 +1,109 @@
+from tasks.cephfs.cephfs_test_case import CephFSTestCase
+import json
+import logging
+
+log = logging.getLogger(__name__)
+failure = "using old balancer; mantle failed for balancer="
+success = "mantle balancer version changed: "
+
+class TestMantle(CephFSTestCase):
+    def start_mantle(self):
+        self.wait_for_health_clear(timeout=30)
+        self.fs.set_max_mds(2)
+        self.wait_until_equal(lambda: len(self.fs.get_active_names()), 2, 30,
+                              reject_fn=lambda v: v > 2 or v < 1)
+
+        for m in self.fs.get_active_names():
+            self.fs.mds_asok(['config', 'set', 'debug_objecter', '20'], mds_id=m)
+            self.fs.mds_asok(['config', 'set', 'debug_ms', '0'], mds_id=m)
+            self.fs.mds_asok(['config', 'set', 'debug_mds', '0'], mds_id=m)
+            self.fs.mds_asok(['config', 'set', 'debug_mds_balancer', '5'], mds_id=m)
+
+    def push_balancer(self, obj, lua_code, expect):
+        self.fs.mon_manager.raw_cluster_cmd_result('fs', 'set', self.fs.name, 'balancer', obj)
+        self.fs.rados(["put", obj, "-"], stdin_data=lua_code)
+        with self.assert_cluster_log(failure + obj + " " + expect):
+            log.info("run a " + obj + " balancer that expects=" + expect)
+
+    def test_version_empty(self):
+        self.start_mantle()
+        expect = " : (2) No such file or directory"
+
+        ret = self.fs.mon_manager.raw_cluster_cmd_result('fs', 'set', self.fs.name, 'balancer')
+        assert(ret == 22) # EINVAL
+
+        self.fs.mon_manager.raw_cluster_cmd_result('fs', 'set', self.fs.name, 'balancer', " ")
+        with self.assert_cluster_log(failure + " " + expect): pass
+
+    def test_version_not_in_rados(self):
+        self.start_mantle()
+        expect = failure + "ghost.lua : (2) No such file or directory"
+        self.fs.mon_manager.raw_cluster_cmd_result('fs', 'set', self.fs.name, 'balancer', "ghost.lua")
+        with self.assert_cluster_log(expect): pass
+
+    def test_balancer_invalid(self):
+        self.start_mantle()
+        expect = ": (22) Invalid argument"
+
+        lua_code = "this is invalid lua code!"
+        self.push_balancer("invalid.lua", lua_code, expect)
+
+        lua_code = "BAL_LOG()"
+        self.push_balancer("invalid_log.lua", lua_code, expect)
+
+        lua_code = "BAL_LOG(0)"
+        self.push_balancer("invalid_log_again.lua", lua_code, expect)
+
+    def test_balancer_valid(self):
+        self.start_mantle()
+        lua_code = "BAL_LOG(0, \"test\")\nreturn {3, 4}"
+        self.fs.mon_manager.raw_cluster_cmd_result('fs', 'set', self.fs.name, 'balancer', "valid.lua")
+        self.fs.rados(["put", "valid.lua", "-"], stdin_data=lua_code)
+        with self.assert_cluster_log(success + "valid.lua"):
+            log.info("run a valid.lua balancer")
+
+    def test_return_invalid(self):
+        self.start_mantle()
+        expect = ": (22) Invalid argument"
+
+        lua_code = "return \"hello\""
+        self.push_balancer("string.lua", lua_code, expect)
+
+        lua_code = "return 3"
+        self.push_balancer("number.lua", lua_code, expect)
+
+        lua_code = "return {}"
+        self.push_balancer("dict_empty.lua", lua_code, expect)
+
+        lua_code = "return {\"this\", \"is\", \"a\", \"test\"}"
+        self.push_balancer("dict_of_strings.lua", lua_code, expect)
+
+        lua_code = "return {3, \"test\"}"
+        self.push_balancer("dict_of_mixed.lua", lua_code, expect)
+
+        lua_code = "return {3}"
+        self.push_balancer("not_enough_numbers.lua", lua_code, expect)
+
+        lua_code = "return {3, 4, 5, 6, 7, 8, 9}"
+        self.push_balancer("too_many_numbers.lua", lua_code, expect)
+
+    def test_dead_osd(self):
+        self.start_mantle()
+        expect = " : (110) Connection timed out"
+
+        # kill the OSDs so that the balancer pull from RADOS times out
+        osd_map = json.loads(self.fs.mon_manager.raw_cluster_cmd('osd', 'dump', '--format=json-pretty'))
+        for i in range(0, len(osd_map['osds'])):
+          self.fs.mon_manager.raw_cluster_cmd_result('osd', 'down', str(i))
+          self.fs.mon_manager.raw_cluster_cmd_result('osd', 'out', str(i))
+
+        # trigger a pull from RADOS
+        self.fs.mon_manager.raw_cluster_cmd_result('fs', 'set', self.fs.name, 'balancer', "valid.lua")
+
+        # make the timeout a little longer since dead OSDs spam ceph -w
+        with self.assert_cluster_log(failure + "valid.lua" + expect, timeout=30):
+            log.info("run a balancer that should timeout")
+
+        # cleanup
+        for i in range(0, len(osd_map['osds'])):
+          self.fs.mon_manager.raw_cluster_cmd_result('osd', 'in', str(i))