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
14 extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size);
15 int 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 */
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
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