2017-11-19 17:05:11 +03:00
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// SPDX-License-Identifier: GPL-2.0
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2018-01-01 02:00:00 +03:00
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/* Copyright (C) 2006-2018 B.A.T.M.A.N. contributors:
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2010-12-13 14:19:28 +03:00
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*
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* Simon Wunderlich, Marek Lindner
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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2013-11-03 23:40:48 +04:00
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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2010-12-13 14:19:28 +03:00
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*/
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#include "hash.h"
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2015-04-17 20:40:28 +03:00
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#include "main.h"
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2017-11-19 19:12:02 +03:00
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#include <linux/gfp.h>
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2015-04-17 20:40:28 +03:00
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#include <linux/lockdep.h>
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#include <linux/slab.h>
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2010-12-13 14:19:28 +03:00
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/* clears the hash */
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2012-06-06 00:31:28 +04:00
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static void batadv_hash_init(struct batadv_hashtable *hash)
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2010-12-13 14:19:28 +03:00
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{
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2015-05-26 19:34:26 +03:00
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u32 i;
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2010-12-13 14:19:28 +03:00
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2012-06-17 18:27:22 +04:00
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for (i = 0; i < hash->size; i++) {
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2010-12-13 14:19:28 +03:00
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INIT_HLIST_HEAD(&hash->table[i]);
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2011-01-19 23:01:40 +03:00
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spin_lock_init(&hash->list_locks[i]);
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}
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2010-12-13 14:19:28 +03:00
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}
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2017-12-02 21:51:53 +03:00
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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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2012-06-06 00:31:28 +04:00
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void batadv_hash_destroy(struct batadv_hashtable *hash)
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2010-12-13 14:19:28 +03:00
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{
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2011-01-19 23:01:40 +03:00
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kfree(hash->list_locks);
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2010-12-13 14:19:28 +03:00
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kfree(hash->table);
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kfree(hash);
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}
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2017-12-02 21:51:53 +03:00
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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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2015-05-26 19:34:26 +03:00
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struct batadv_hashtable *batadv_hash_new(u32 size)
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2010-12-13 14:19:28 +03:00
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{
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2012-06-06 00:31:28 +04:00
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struct batadv_hashtable *hash;
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2010-12-13 14:19:28 +03:00
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2011-05-15 01:14:54 +04:00
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hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
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2010-12-13 14:19:28 +03:00
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if (!hash)
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return NULL;
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2014-05-24 08:43:47 +04:00
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hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC);
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2011-01-19 23:01:40 +03:00
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if (!hash->table)
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goto free_hash;
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2010-12-13 14:19:28 +03:00
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2014-05-24 08:43:47 +04:00
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hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks),
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GFP_ATOMIC);
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2011-01-19 23:01:40 +03:00
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if (!hash->list_locks)
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goto free_table;
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2010-12-13 14:19:28 +03:00
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2011-01-19 23:01:40 +03:00
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hash->size = size;
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2012-05-12 20:33:58 +04:00
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batadv_hash_init(hash);
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2010-12-13 14:19:28 +03:00
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return hash;
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2011-01-19 23:01:40 +03:00
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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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2012-03-29 14:38:20 +04:00
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2017-12-02 21:51:53 +03:00
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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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2012-06-06 00:31:28 +04:00
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void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
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2012-03-29 14:38:20 +04:00
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struct lock_class_key *key)
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{
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2015-05-26 19:34:26 +03:00
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u32 i;
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2012-03-29 14:38:20 +04:00
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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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