mds: invalid id for client eviction is to be treated as success

Introduced-by: 0ef5941
Fixes: http://tracker.ceph.com/issues/68132
Signed-off-by: Venky Shankar <[email protected]>

Author: vshankar

qa/tasks/cephfs/test_misc.py

@@ -558,16 +558,18 @@ def _evict_with_id_zero(self, cmd):
         self.assertEqual(ce.exception.exitstatus, errno.EINVAL)
 
     def _evict_with_invalid_id(self, cmd):
+        info_initial = self.fs.rank_asok(cmd + ['ls'])
         # with invalid id
-        with self.assertRaises(CommandFailedError) as ce:
-            self.fs.rank_tell(cmd + ['evict', 'id=1'])
-        self.assertEqual(ce.exception.exitstatus, errno.ESRCH)
+        self.fs.rank_tell(cmd + ['evict', 'id=1'])
+        info = self.fs.rank_asok(cmd + ['ls'])
+        self.assertEqual(len(info), len(info_initial)) # session list is status-quo
 
     def _evict_with_negative_id(self, cmd):
+        info_initial = self.fs.rank_asok(cmd + ['ls'])
         # with negative id
-        with self.assertRaises(CommandFailedError) as ce:
-            self.fs.rank_tell(cmd + ['evict', 'id=-9'])
-        self.assertEqual(ce.exception.exitstatus, errno.ESRCH)
+        self.fs.rank_tell(cmd + ['evict', 'id=-9'])
+        info = self.fs.rank_asok(cmd + ['ls'])
+        self.assertEqual(len(info), len(info_initial)) # session list is status-quo
 
     def _evict_with_valid_id(self, cmd):
         info_initial = self.fs.rank_asok(cmd + ['ls'])

src/mds/MDSRank.cc

@@ -3149,7 +3149,7 @@ void MDSRankDispatcher::evict_clients(
   dout(20) << __func__ << " matched " << victims.size() << " sessions" << dendl;
 
   if (victims.empty()) {
-    on_finish(-ESRCH, "no hosts match", outbl);
+    on_finish(0, "no hosts match", outbl);
     return;
   }