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 extern int crush_do_rule(const struct crush_map *map, 15 int ruleno, 16 int x, int *result, int result_max, 17 const __u32 *weights, int weight_max, 18 void *cwin); 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 */ 26 static 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 32 void crush_init_workspace(const struct crush_map *map, void *v); 33 34 #endif 35