mirror of https://gitee.com/openkylin/linux.git
85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2006-2019 B.A.T.M.A.N. contributors:
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*
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* Simon Wunderlich, Marek Lindner
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*/
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#include "hash.h"
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#include "main.h"
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#include <linux/gfp.h>
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#include <linux/lockdep.h>
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#include <linux/slab.h>
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/* clears the hash */
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static void batadv_hash_init(struct batadv_hashtable *hash)
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{
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u32 i;
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for (i = 0; i < hash->size; i++) {
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INIT_HLIST_HEAD(&hash->table[i]);
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spin_lock_init(&hash->list_locks[i]);
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}
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atomic_set(&hash->generation, 0);
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}
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/**
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* batadv_hash_destroy() - Free only the hashtable and the hash itself
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* @hash: hash object to destroy
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*/
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void batadv_hash_destroy(struct batadv_hashtable *hash)
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{
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kfree(hash->list_locks);
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kfree(hash->table);
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kfree(hash);
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}
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/**
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* batadv_hash_new() - Allocates and clears the hashtable
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* @size: number of hash buckets to allocate
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*
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* Return: newly allocated hashtable, NULL on errors
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*/
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struct batadv_hashtable *batadv_hash_new(u32 size)
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{
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struct batadv_hashtable *hash;
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hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
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if (!hash)
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return NULL;
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hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC);
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if (!hash->table)
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goto free_hash;
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hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks),
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GFP_ATOMIC);
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if (!hash->list_locks)
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goto free_table;
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hash->size = size;
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batadv_hash_init(hash);
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return hash;
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free_table:
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kfree(hash->table);
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free_hash:
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kfree(hash);
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return NULL;
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}
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/**
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* batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks
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* @hash: hash object to modify
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* @key: lockdep class key address
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*/
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void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
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struct lock_class_key *key)
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{
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u32 i;
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for (i = 0; i < hash->size; i++)
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lockdep_set_class(&hash->list_locks[i], key);
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}
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