From c09878e92a9394237e181d91a668622e3cdf885e Mon Sep 17 00:00:00 2001
From: Greg Farnum <greg@inktank.com>
Date: Tue, 11 Mar 2014 20:20:41 -0700
Subject: [PATCH] Mutation: move self_ref into MutationImpl instead of
 MDRequestImpl

We keep an MDRequestImpl::set_self_ref(MDRequestRef&) function so
that we don't need to do the pointer conversion elsewhere.

Signed-off-by: Greg Farnum <greg@inktank.com>
---
 src/mds/Mutation.h | 17 ++++++++++-------
 src/mds/Server.cc  |  2 +-
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/src/mds/Mutation.h b/src/mds/Mutation.h
index 0f7ce236b90f5..53243df739b95 100644
--- a/src/mds/Mutation.h
+++ b/src/mds/Mutation.h
@@ -34,6 +34,7 @@ class MClientRequest;
 class MMDSSlaveRequest;
 
 struct MutationImpl {
+  ceph::weak_ptr<MutationImpl> self_ref;
   metareqid_t reqid;
   __u32 attempt;      // which attempt for this request
   LogSegment *ls;  // the log segment i'm committing to
@@ -79,14 +80,16 @@ struct MutationImpl {
   list<pair<CDentry*,version_t> > dirty_cow_dentries;
 
   MutationImpl()
-    : attempt(0),
+    : self_ref(),
+      attempt(0),
       ls(0),
       slave_to_mds(-1),
       locking(NULL),
       locking_target_mds(-1),
       done_locking(false), committing(false), aborted(false), killed(false) { }
   MutationImpl(metareqid_t ri, __u32 att=0, int slave_to=-1)
-    : reqid(ri), attempt(att),
+    : self_ref(),
+      reqid(ri), attempt(att),
       ls(0),
       slave_to_mds(slave_to), 
       locking(NULL),
@@ -138,6 +141,10 @@ struct MutationImpl {
   virtual void print(ostream &out) {
     out << "mutation(" << this << ")";
   }
+
+  void set_self_ref(ceph::shared_ptr<MutationImpl>& ref) {
+    self_ref = ref;
+  }
 };
 
 inline ostream& operator<<(ostream& out, MutationImpl &mut)
@@ -156,7 +163,6 @@ typedef ceph::shared_ptr<MutationImpl> MutationRef;
  * the request is finished or forwarded.  see request_*().
  */
 struct MDRequestImpl : public MutationImpl {
-  ceph::weak_ptr<MDRequestImpl> self_ref;
   Session *session;
   elist<MDRequestImpl*>::item item_session_request;  // if not on list, op is aborted.
 
@@ -252,7 +258,6 @@ struct MDRequestImpl : public MutationImpl {
 
   // ---------------------------------------------------
   MDRequestImpl() :
-    self_ref(),
     session(0), item_session_request(this),
     client_request(0), straydn(NULL), snapid(CEPH_NOSNAP), tracei(0), tracedn(0),
     alloc_ino(0), used_prealloc_ino(0), snap_caps(0), did_early_reply(false),
@@ -266,7 +271,6 @@ struct MDRequestImpl : public MutationImpl {
     in[0] = in[1] = 0; 
   }
   MDRequestImpl(metareqid_t ri, __u32 attempt, MClientRequest *req) :
-    self_ref(),
     MutationImpl(ri, attempt),
     session(0), item_session_request(this),
     client_request(req), straydn(NULL), snapid(CEPH_NOSNAP), tracei(0), tracedn(0),
@@ -281,7 +285,6 @@ struct MDRequestImpl : public MutationImpl {
     in[0] = in[1] = 0; 
   }
   MDRequestImpl(metareqid_t ri, __u32 attempt, int by) :
-    self_ref(),
     MutationImpl(ri, attempt, by),
     session(0), item_session_request(this),
     client_request(0), straydn(NULL), snapid(CEPH_NOSNAP), tracei(0), tracedn(0),
@@ -312,7 +315,7 @@ struct MDRequestImpl : public MutationImpl {
 
   void print(ostream &out);
   void set_self_ref(ceph::shared_ptr<MDRequestImpl>& ref) {
-    self_ref = ref;
+    self_ref = ceph::static_pointer_cast<MutationImpl,MDRequestImpl>(ref);
   }
 };
 
diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 2521b60046125..69f302b376726 100644
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -548,7 +548,7 @@ void Server::journal_close_session(Session *session, int state)
     session->requests.begin(member_offset(MDRequestImpl,
 					  item_session_request));
   while (!p.end()) {
-    MDRequestRef mdrp = (*p)->self_ref.lock();
+    MDRequestRef mdr = ceph::static_pointer_cast<MDRequestImpl,MutationImpl>((*p)->self_ref.lock());
     assert(mdr);
     ++p;
     mdcache->request_kill(mdr);
-- 
2.39.5