mon: retry PGStats message on EAGAIN

If we get EAGAIN from a paxos restart/election/whatever, we should
restart the message instead of just blindly acking it.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Joao Luis <joao.luis@inktank.com>
(cherry picked from commit 4837063d447afb45554f55bb6fde1c97559acd4b)

1 files changed, 6 insertions, 3 deletions

diff --git a/src/mon/PGMonitor.h b/src/mon/PGMonitor.h
index 2927c00453a..5db1744111d 100644
--- a/src/mon/PGMonitor.h
+++ b/src/mon/PGMonitor.h
@@ -71,12 +71,15 @@ private:
     entity_inst_t who;
     C_Stats(PGMonitor *p, MPGStats *r, MPGStatsAck *a) : pgmon(p), req(r), ack(a) {}
     void finish(int r) {
-      if (r == -ECANCELED) {
+      if (r >= 0) {
+	pgmon->_updated_stats(req, ack);
+      } else if (r == -ECANCELED) {
 	req->put();
 	ack->put();
-	return;
+      } else {
+	ack->put();
+	dispatch(req);
       }
-      pgmon->_updated_stats(req, ack);
     }    
   };