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9165dac822
Reviewed-by: Matthew Sakai <msakai@redhat.com> Signed-off-by: Bruce Johnston <bjohnsto@redhat.com> Signed-off-by: Matthew Sakai <msakai@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2023 Red Hat
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*/
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#ifndef VDO_INT_MAP_H
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#define VDO_INT_MAP_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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/**
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* DOC: int_map
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*
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* An int_map associates pointers (void *) with integer keys (u64). NULL pointer values are
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* not supported.
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*
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* The map is implemented as hash table, which should provide constant-time insert, query, and
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* remove operations, although the insert may occasionally grow the table, which is linear in the
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* number of entries in the map. The table will grow as needed to hold new entries, but will not
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* shrink as entries are removed.
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*/
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struct int_map;
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int __must_check vdo_int_map_create(size_t initial_capacity, struct int_map **map_ptr);
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void vdo_int_map_free(struct int_map *map);
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size_t vdo_int_map_size(const struct int_map *map);
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void *vdo_int_map_get(struct int_map *map, u64 key);
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int __must_check vdo_int_map_put(struct int_map *map, u64 key, void *new_value,
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bool update, void **old_value_ptr);
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void *vdo_int_map_remove(struct int_map *map, u64 key);
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#endif /* VDO_INT_MAP_H */
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