#ifndef CEPH_CRUSH_MAPPER_H
  #define CEPH_CRUSH_MAPPER_H
  
  /*
   * CRUSH functions for find rules and then mapping an input to an
   * output set.
   *
   * LGPL2
   */
  
  #include "crush.h"
  
  extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size);
  extern int crush_do_rule(const struct crush_map *map,
  			 int ruleno,
  			 int x, int *result, int result_max,
  			 const __u32 *weights, int weight_max,
  			 int *scratch);
  
  #endif