From bf22699fb36159bb71ceba0cf50bce3b2673802e Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Thu, 13 Sep 2018 10:22:01 +0300
Subject: [PATCH] mdbx: avoid empty and unneeded large/overflow pages.

Change-Id: I388a60180b999889fc15a1f3f3243c007a15edc6
---
 src/mdbx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/mdbx.c b/src/mdbx.c
index 36606ef4..cd8d3761 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -8229,7 +8229,10 @@ int mdbx_cursor_put(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data,
     if (F_ISSET(leaf->mn_flags, F_BIGDATA)) {
       MDBX_page *omp;
       pgno_t pg;
-      int level, ovpages, dpages = OVPAGES(env, data->iov_len);
+      int level, ovpages,
+          dpages = (LEAFSIZE(key, data) > env->me_nodemax)
+                       ? OVPAGES(env, data->iov_len)
+                       : 0;
 
       memcpy(&pg, olddata.iov_base, sizeof(pg));
       if (unlikely((rc2 = mdbx_page_get(mc, pg, &omp, &level)) != 0))