From 355f64ad07537a4f21dc6fe4cef66324316aa84b Mon Sep 17 00:00:00 2001 From: Howard Chu Date: Wed, 18 Nov 2015 10:24:41 +0000 Subject: [PATCH] ITS#8311 add comment --- libraries/liblmdb/mdb.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c index f3c87bf..6bd025d 100644 --- a/libraries/liblmdb/mdb.c +++ b/libraries/liblmdb/mdb.c @@ -8372,6 +8372,11 @@ 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;