lookup_level0_dirty
found = lookup_level0_dirty(c, key, &znode, &n);
found = lookup_level0_dirty(c, key, &znode, &n);
found = lookup_level0_dirty(c, key, &znode, &n);
found = lookup_level0_dirty(c, key, &znode, &n);
err = lookup_level0_dirty(c, key, &znode, &n);
err = lookup_level0_dirty(c, key, &znode, &n);