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1#ifndef CEPH_CRUSH_MAPPER_H
2#define CEPH_CRUSH_MAPPER_H
3
4/*
5 * CRUSH functions for find rules and then mapping an input to an
6 * output set.
7 *
8 * LGPL2
9 */
10
11#include "crush.h"
12
13extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size);
14extern int crush_do_rule(const struct crush_map *map,
15 int ruleno,
16 int x, int *result, int result_max,
17 const __u32 *weights, int weight_max,
18 void *cwin);
19
20/*
21 * Returns the exact amount of workspace that will need to be used
22 * for a given combination of crush_map and result_max. The caller can
23 * then allocate this much on its own, either on the stack, in a
24 * per-thread long-lived buffer, or however it likes.
25 */
26static inline size_t crush_work_size(const struct crush_map *map,
27 int result_max)
28{
29 return map->working_size + result_max * 3 * sizeof(__u32);
30}
31
32void crush_init_workspace(const struct crush_map *map, void *v);
33
34#endif