root/include/linux/crush/mapper.h

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#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 <linux/crush/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
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