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 34