From d327a36ad8c2602173da7bf2fb3b41db80950dc5 Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@symas.com>
Date: Fri, 4 Oct 2013 02:55:34 -0700
Subject: [PATCH] Fix mdb_env_set_mapsize()
Don't allow shrinking below minimum size for an already open env.
---
libraries/liblmdb/mdb.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 0aae740614..ddde69d0b0 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -3319,6 +3319,14 @@ mdb_env_set_mapsize(MDB_env *env, size_t size)
return EINVAL;
if (!size)
size = env->me_metas[mdb_env_pick_meta(env)]->mm_mapsize;
+ else if (size < env->me_mapsize) {
+ /* If the configured size is smaller, make sure it's
+ * still big enough. Silently round up to minimum if not.
+ */
+ size_t minsize = (env->me_metas[mdb_env_pick_meta(env)]->mm_last_pg + 1) * env->me_psize;
+ if (size < minsize)
+ size = minsize;
+ }
munmap(env->me_map, env->me_mapsize);
env->me_mapsize = size;
old = (env->me_flags & MDB_FIXEDMAP) ? env->me_map : NULL;
--
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