/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright 2023 Red Hat */ #ifndef VDO_INT_MAP_H #define VDO_INT_MAP_H #include <linux/compiler.h> #include <linux/types.h> /** * DOC: int_map * * An int_map associates pointers (void *) with integer keys (u64). NULL pointer values are * not supported. * * The map is implemented as hash table, which should provide constant-time insert, query, and * remove operations, although the insert may occasionally grow the table, which is linear in the * number of entries in the map. The table will grow as needed to hold new entries, but will not * shrink as entries are removed. */ struct int_map; int __must_check vdo_int_map_create(size_t initial_capacity, struct int_map **map_ptr); void vdo_int_map_free(struct int_map *map); size_t vdo_int_map_size(const struct int_map *map); void *vdo_int_map_get(struct int_map *map, u64 key); int __must_check vdo_int_map_put(struct int_map *map, u64 key, void *new_value, bool update, void **old_value_ptr); void *vdo_int_map_remove(struct int_map *map, u64 key); #endif /* VDO_INT_MAP_H */