LXR linux/include/linux/crush/mapper.h

   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
  35