From: Howard Chu <hyc@openldap.org>
Date: Wed, 18 Nov 2015 10:24:41 +0000 (+0000)
Subject: ITS#8311 add comment
X-Git-Tag: LMDB_0.9.17~37
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=71c07f0d60be6113e2ea4327a15b3646c19825d0;p=openldap

ITS#8311 add comment
---

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 3f48891f25..fc0340c51e 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -8251,6 +8251,11 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
 	rp->mp_pad = mp->mp_pad;
 	DPRINTF(("new right sibling: page %"Z"u", rp->mp_pgno));
 
+	/* Usually when splitting the root page, the cursor
+	 * height is 1. But when called from mdb_update_key,
+	 * the cursor height may be greater because it walks
+	 * up the stack while finding the branch slot to update.
+	 */
 	if (mc->mc_top < 1) {
 		if ((rc = mdb_page_new(mc, P_BRANCH, 1, &pp)))
 			goto done;