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net/batman-adv/hash.c
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/* Copyright (C) 2006-2017 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, see <http://www.gnu.org/licenses/>.
*/
#include "hash.h"
#include "main.h"
#include <linux/fs.h>
#include <linux/lockdep.h>
#include <linux/slab.h>
/* clears the hash */
static void batadv_hash_init(struct batadv_hashtable *hash)
{
u32 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 batadv_hash_destroy(struct batadv_hashtable *hash)
{
kfree(hash->list_locks);
kfree(hash->table);
kfree(hash);
}
/* allocates and clears the hash */
struct batadv_hashtable *batadv_hash_new(u32 size)
{
struct batadv_hashtable *hash;
hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
if (!hash)
return NULL;
hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC);
if (!hash->table)
goto free_hash;
hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks),
GFP_ATOMIC);
if (!hash->list_locks)
goto free_table;
hash->size = size;
batadv_hash_init(hash);
return hash;
free_table:
kfree(hash->table);
free_hash:
kfree(hash);
return NULL;
}
void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
struct lock_class_key *key)
{
u32 i;
for (i = 0; i < hash->size; i++)
lockdep_set_class(&hash->list_locks[i], key);
}
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