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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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