include/linux/crush/mapper.h

   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
  13 extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size);
  14 int 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  */
  25 static 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
  31 void crush_init_workspace(const struct crush_map *map, void *v);
  32
  33 #endif