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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright 2023 Red Hat4 */5 6#ifndef VDO_INT_MAP_H7#define VDO_INT_MAP_H8 9#include <linux/compiler.h>10#include <linux/types.h>11 12/**13 * DOC: int_map14 *15 * An int_map associates pointers (void *) with integer keys (u64). NULL pointer values are16 * not supported.17 *18 * The map is implemented as hash table, which should provide constant-time insert, query, and19 * remove operations, although the insert may occasionally grow the table, which is linear in the20 * number of entries in the map. The table will grow as needed to hold new entries, but will not21 * shrink as entries are removed.22 */23 24struct int_map;25 26int __must_check vdo_int_map_create(size_t initial_capacity, struct int_map **map_ptr);27 28void vdo_int_map_free(struct int_map *map);29 30size_t vdo_int_map_size(const struct int_map *map);31 32void *vdo_int_map_get(struct int_map *map, u64 key);33 34int __must_check vdo_int_map_put(struct int_map *map, u64 key, void *new_value,35 bool update, void **old_value_ptr);36 37void *vdo_int_map_remove(struct int_map *map, u64 key);38 39#endif /* VDO_INT_MAP_H */40