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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);
14int crush_do_rule(const struct crush_map *map,
15 int ruleno, int x, int *result, int result_max,
16 const __u32 *weight, int weight_max,
17 void *cwin, const struct crush_choose_arg *choose_args);
18
19/*
20 * Returns the exact amount of workspace that will need to be used
21 * for a given combination of crush_map and result_max. The caller can
22 * then allocate this much on its own, either on the stack, in a
23 * per-thread long-lived buffer, or however it likes.
24 */
25static inline size_t crush_work_size(const struct crush_map *map,
26 int result_max)
27{
28 return map->working_size + result_max * 3 * sizeof(__u32);
29}
30
31void crush_init_workspace(const struct crush_map *map, void *v);
32
33#endif