/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef CEPH_CRUSH_MAPPER_H
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#define CEPH_CRUSH_MAPPER_H
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/*
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* CRUSH functions for find rules and then mapping an input to an
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* output set.
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*
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* LGPL2
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*/
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#include "crush.h"
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extern int crush_find_rule(const struct crush_map *map, int ruleset, int type, int size);
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int crush_do_rule(const struct crush_map *map,
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int ruleno, int x, int *result, int result_max,
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const __u32 *weight, int weight_max,
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void *cwin, const struct crush_choose_arg *choose_args);
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/*
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* Returns the exact amount of workspace that will need to be used
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* for a given combination of crush_map and result_max. The caller can
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* then allocate this much on its own, either on the stack, in a
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* per-thread long-lived buffer, or however it likes.
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*/
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static inline size_t crush_work_size(const struct crush_map *map,
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int result_max)
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{
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return map->working_size + result_max * 3 * sizeof(__u32);
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}
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void crush_init_workspace(const struct crush_map *map, void *v);
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#endif
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