[mirror_ubuntu-artful-kernel.git] / include / linux / crush / mapper.h

#ifndef CEPH_CRUSH_MAPPER_H
#define CEPH_CRUSH_MAPPER_H

/*
 * CRUSH functions for find rules and then mapping an input to an
 * output set.
 *
 * LGPL2
 */

#include "crush.h"

extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size);
extern int crush_do_rule(const struct crush_map *map,
			 int ruleno,
			 int x, int *result, int result_max,
			 const __u32 *weights, int weight_max,
			 void *cwin);

/*
 * Returns the exact amount of workspace that will need to be used
 * for a given combination of crush_map and result_max. The caller can
 * then allocate this much on its own, either on the stack, in a
 * per-thread long-lived buffer, or however it likes.
 */
static inline size_t crush_work_size(const struct crush_map *map,
				     int result_max)
{
	return map->working_size + result_max * 3 * sizeof(__u32);
}

void crush_init_workspace(const struct crush_map *map, void *v);

#endif
Commit	Line	Data
5cd068c2 SW	1	#ifndef CEPH_CRUSH_MAPPER_H
5cd068c2 SW	2	#define CEPH_CRUSH_MAPPER_H
5ecc0a0f SW	3
	4	/*
	5	* CRUSH functions for find rules and then mapping an input to an
	6	* output set.
	7	*
	8	* LGPL2
	9	*/
	10
b459be73	11	#include "crush.h"
5ecc0a0f	12
8b12d47b SW	13	extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size);
8b12d47b SW	14	extern int crush_do_rule(const struct crush_map *map,
5ecc0a0f SW	15	int ruleno,
5ecc0a0f SW	16	int x, int *result, int result_max,
e8ef19c4	17	const __u32 *weights, int weight_max,
743efcff ID	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	}
66a0e2d5 ID	31
66a0e2d5 ID	32	void crush_init_workspace(const struct crush_map map, void v);
5ecc0a0f SW	33
5ecc0a0f SW	34	#endif