/* Copyright (c) 2017 Facebook
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   */
  #ifndef __MAP_IN_MAP_H__
  #define __MAP_IN_MAP_H__
  
  #include <linux/types.h>
  
  struct file;
  struct bpf_map;
  
  struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd);
  void bpf_map_meta_free(struct bpf_map *map_meta);
  bool bpf_map_meta_equal(const struct bpf_map *meta0,
  			const struct bpf_map *meta1);
  void *bpf_map_fd_get_ptr(struct bpf_map *map, struct file *map_file,
  			 int ufd);
  void bpf_map_fd_put_ptr(void *ptr);
  u32 bpf_map_fd_sys_lookup_elem(void *ptr);
  
  #endif