From 985a981059bcda0c1753590b0acbab7f8da1f26e Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Tue, 6 Apr 2010 10:47:02 -0700
Subject: [PATCH] mds: move new stray dentries to end of lru

---
 src/mds/MDCache.h | 2 ++
 src/mds/Server.cc | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/src/mds/MDCache.h b/src/mds/MDCache.h
index 3451fbbf2bbd..09c52ae8dc3d 100644
--- a/src/mds/MDCache.h
+++ b/src/mds/MDCache.h
@@ -884,9 +884,11 @@ public:
     else
       lru.lru_midtouch(dn);
   }
+public:
   void touch_dentry_bottom(CDentry *dn) {
     lru.lru_bottouch(dn);
   }
+protected:
 
   void inode_remove_replica(CInode *in, int rep);
   void dentry_remove_replica(CDentry *dn, int rep);
diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 3cbe1154102b..4cfa045aa845 100644
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -3836,6 +3836,8 @@ void Server::_unlink_local_finish(MDRequest *mdr,
     straydnl->get_inode()->snaprealm->add_past_parent(oldparent);
     if (isnew)
       mdcache->do_realm_invalidate_and_update_notify(straydnl->get_inode(), CEPH_SNAP_OP_SPLIT);
+
+    mdcache->touch_dentry_bottom(straydn);
   }
 
   dn->mark_dirty(dnpv, mdr->ls);  
@@ -4595,6 +4597,8 @@ void Server::_rename_apply(MDRequest *mdr, CDentry *srcdn, CDentry *destdn, CDen
 	  mdcache->do_realm_invalidate_and_update_notify(straydnl->get_inode(), CEPH_SNAP_OP_SPLIT);
       }
 
+      mdcache->touch_dentry_bottom(straydn);  // drop dn as quickly as possible.
+
     } else {
       destdn->get_dir()->unlink_inode(destdn);
     }
-- 
2.47.3