Merge pull request #11052 from yuyuyu101/wip-shutdown-deadlock

OSD: avoid FileStore finisher deadlock in osd_lock when shutdown OSD

Reviewed-by: Sage Weil <sage@redhat.com>

src/osd/OSD.cc

@@ -6868,11 +6868,11 @@ void OSD::handle_osd_map(MOSDMap *m)
 void OSD::_committed_osd_maps(epoch_t first, epoch_t last, MOSDMap *m)
 {
   dout(10) << __func__ << " " << first << ".." << last << dendl;
-  Mutex::Locker l(osd_lock);
   if (is_stopping()) {
     dout(10) << __func__ << " bailing, we are shutting down" << dendl;
     return;
   }
+  Mutex::Locker l(osd_lock);
   map_lock.get_write();
 
   bool do_shutdown = false;