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Fix mdb_env_set_mapsize()

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Don't allow shrinking below minimum size for an already open env.
This commit is contained in:
Howard Chu 2013-10-04 02:55:34 -07:00
parent 2520247ba1
commit d327a36ad8
1 changed files with 8 additions and 0 deletions
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8
libraries/liblmdb/mdb.c
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@ -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;