From: Howard Chu <hyc@symas.com>
Date: Thu, 2 Oct 2014 21:11:43 +0000 (+0100)
Subject: ITS#7956 fix compact of empty env
X-Git-Tag: LMDB_0.9.15~59
X-Git-Url: https://git.sur5r.net/?p=openldap;a=commitdiff_plain;h=98ed192949fcc3f0861c68a694dd5e1c0add14f4

ITS#7956 fix compact of empty env
---

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index a7659a5b3c..cfa24bf0db 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -8589,8 +8589,12 @@ mdb_env_copyfd1(MDB_env *env, HANDLE fd)
 		/* Set metapage 1 */
 		mm->mm_last_pg = txn->mt_next_pgno - freecount - 1;
 		mm->mm_dbs[1] = txn->mt_dbs[1];
-		mm->mm_dbs[1].md_root = mm->mm_last_pg;
-		mm->mm_txnid = 1;
+		if (mm->mm_last_pg > 1) {
+			mm->mm_dbs[1].md_root = mm->mm_last_pg;
+			mm->mm_txnid = 1;
+		} else {
+			mm->mm_dbs[1].md_root = P_INVALID;
+		}
 	}
 	my.mc_wlen[0] = env->me_psize * 2;
 	my.mc_txn = txn;