From ce9c4acea6d5c58eb6aa1a8efef4f8256e8f072e Mon Sep 17 00:00:00 2001
From: Leo Yuriev <leo@yuriev.ru>
Date: Sun, 23 Apr 2017 18:59:16 +0300
Subject: [PATCH] mdbx: fix mdbg_canary_put().

Change-Id: I36917a686b28405ed7ecd07dbeb1b4d517720410
---
 src/mdbx.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/mdbx.c b/src/mdbx.c
index 3ed4c46d..cfca3b5a 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -9787,7 +9787,12 @@ int mdbx_canary_put(MDB_txn *txn, const mdbx_canary *canary) {
     txn->mt_canary.z = canary->z;
   }
   txn->mt_canary.v = txn->mt_txnid;
-  txn->mt_flags |= MDB_TXN_DIRTY;
+
+  if ((txn->mt_flags & MDB_TXN_DIRTY) == 0) {
+    MDB_env *env = txn->mt_env;
+    txn->mt_flags |= MDB_TXN_DIRTY;
+    env->me_sync_pending += env->me_psize;
+  }
 
   return MDB_SUCCESS;
 }