client: flush cap release on session flush

MDS expects the completed cap release prior to responding to the session flush
for cache drop.

Fixes: http://tracker.ceph.com/issues/38009
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit 59eca7a17816317d5064840745ea5e28d3349d1a)

Conflicts:
	src/client/Client.cc
- use m.detach() instead of std::move(m) as argument to send_message()

diff --git a/src/client/Client.cc b/src/client/Client.cc
index b11a9d7824de3b299ffb0c2ea2082f4237ebb6cf..838be01ad928495119814965614d5e6f2488857c 100644 (file)
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -2119,6 +2119,10 @@ void Client::handle_client_session(MClientSession *m)
     break;
 
   case CEPH_SESSION_FLUSHMSG:
+    /* flush cap release */
+    if (auto& m = session->release; m) {
+      session->con->send_message(m.detach());
+    }
     session->con->send_message(new MClientSession(CEPH_SESSION_FLUSHMSG_ACK, m->get_seq()));
     break;