mds: fix NULL pointer dereference in Server::handle_client_rename

Inode's parent dentry can be NULL, which causes segment fault in
Locker::acquire_locks

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 4b6b752ccb7d7d1dc2949aa3ac5e2be4015f36ba..2c0f82a9825a648bdfeabb1775820f4812408e4d 100644 (file)
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -5689,9 +5689,9 @@ void Server::handle_client_rename(MDRequest *mdr)
     // open_remote_ino() with 'want_locked=true' when the srcdn or destdn
     // is traversed.
     if (srcdnl->is_remote())
-      xlocks.insert(&srci->get_parent_dn()->lock);
+      xlocks.insert(&srci->get_projected_parent_dn()->lock);
     if (destdnl->is_remote())
-      xlocks.insert(&oldin->get_parent_dn()->lock);
+      xlocks.insert(&oldin->get_projected_parent_dn()->lock);
   }
 
   // we need to update srci's ctime.  xlock its least contended lock to do that...