forked from luck/tmp_suning_uos_patched
b4d0d230cc
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public licence as published by the free software foundation either version 2 of the licence or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 114 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520170857.552531963@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Generic associative array implementation.
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*
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* See Documentation/core-api/assoc_array.rst for information.
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*
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* Copyright (C) 2013 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#ifndef _LINUX_ASSOC_ARRAY_H
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#define _LINUX_ASSOC_ARRAY_H
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#ifdef CONFIG_ASSOCIATIVE_ARRAY
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#include <linux/types.h>
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#define ASSOC_ARRAY_KEY_CHUNK_SIZE BITS_PER_LONG /* Key data retrieved in chunks of this size */
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/*
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* Generic associative array.
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*/
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struct assoc_array {
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struct assoc_array_ptr *root; /* The node at the root of the tree */
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unsigned long nr_leaves_on_tree;
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};
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/*
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* Operations on objects and index keys for use by array manipulation routines.
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*/
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struct assoc_array_ops {
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/* Method to get a chunk of an index key from caller-supplied data */
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unsigned long (*get_key_chunk)(const void *index_key, int level);
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/* Method to get a piece of an object's index key */
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unsigned long (*get_object_key_chunk)(const void *object, int level);
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/* Is this the object we're looking for? */
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bool (*compare_object)(const void *object, const void *index_key);
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/* How different is an object from an index key, to a bit position in
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* their keys? (or -1 if they're the same)
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*/
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int (*diff_objects)(const void *object, const void *index_key);
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/* Method to free an object. */
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void (*free_object)(void *object);
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};
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/*
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* Access and manipulation functions.
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*/
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struct assoc_array_edit;
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static inline void assoc_array_init(struct assoc_array *array)
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{
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array->root = NULL;
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array->nr_leaves_on_tree = 0;
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}
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extern int assoc_array_iterate(const struct assoc_array *array,
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int (*iterator)(const void *object,
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void *iterator_data),
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void *iterator_data);
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extern void *assoc_array_find(const struct assoc_array *array,
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const struct assoc_array_ops *ops,
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const void *index_key);
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extern void assoc_array_destroy(struct assoc_array *array,
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const struct assoc_array_ops *ops);
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extern struct assoc_array_edit *assoc_array_insert(struct assoc_array *array,
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const struct assoc_array_ops *ops,
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const void *index_key,
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void *object);
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extern void assoc_array_insert_set_object(struct assoc_array_edit *edit,
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void *object);
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extern struct assoc_array_edit *assoc_array_delete(struct assoc_array *array,
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const struct assoc_array_ops *ops,
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const void *index_key);
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extern struct assoc_array_edit *assoc_array_clear(struct assoc_array *array,
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const struct assoc_array_ops *ops);
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extern void assoc_array_apply_edit(struct assoc_array_edit *edit);
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extern void assoc_array_cancel_edit(struct assoc_array_edit *edit);
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extern int assoc_array_gc(struct assoc_array *array,
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const struct assoc_array_ops *ops,
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bool (*iterator)(void *object, void *iterator_data),
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void *iterator_data);
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#endif /* CONFIG_ASSOCIATIVE_ARRAY */
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#endif /* _LINUX_ASSOC_ARRAY_H */
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