mapper.h (1002B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef CEPH_CRUSH_MAPPER_H 3#define CEPH_CRUSH_MAPPER_H 4 5/* 6 * CRUSH functions for find rules and then mapping an input to an 7 * output set. 8 * 9 * LGPL2 10 */ 11 12#include "crush.h" 13 14extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size); 15int crush_do_rule(const struct crush_map *map, 16 int ruleno, int x, int *result, int result_max, 17 const __u32 *weight, int weight_max, 18 void *cwin, const struct crush_choose_arg *choose_args); 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