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/*
* Copyright (C) 2006-2012 B.A.T.M.A.N. contributors:
*
* Simon Wunderlich, Marek Lindner
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*
*/
#include "main.h"
#include "hash.h"
/* clears the hash */
static void hash_init(struct hashtable_t *hash)
{
uint32_t i;
for (i = 0 ; i < hash->size; i++) {
INIT_HLIST_HEAD(&hash->table[i]);
spin_lock_init(&hash->list_locks[i]);
}
}
/* free only the hashtable and the hash itself. */
void hash_destroy(struct hashtable_t *hash)
{
kfree(hash->list_locks);
kfree(hash->table);
kfree(hash);
}
/* allocates and clears the hash */
struct hashtable_t *hash_new(uint32_t size)
{
struct hashtable_t *hash;
hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
if (!hash)
return NULL;
hash->table = kmalloc(sizeof(*hash->table) * size, GFP_ATOMIC);
if (!hash->table)
goto free_hash;
hash->list_locks = kmalloc(sizeof(*hash->list_locks) * size,
GFP_ATOMIC);
if (!hash->list_locks)
goto free_table;
hash->size = size;
hash_init(hash);
return hash;
free_table:
kfree(hash->table);
free_hash:
kfree(hash);
return NULL;
}
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