7a79d717e0
Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (C) 2006-2019 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/gfp.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]);
|
|
}
|
|
|
|
atomic_set(&hash->generation, 0);
|
|
}
|
|
|
|
/**
|
|
* batadv_hash_destroy() - Free only the hashtable and the hash itself
|
|
* @hash: hash object to destroy
|
|
*/
|
|
void batadv_hash_destroy(struct batadv_hashtable *hash)
|
|
{
|
|
kfree(hash->list_locks);
|
|
kfree(hash->table);
|
|
kfree(hash);
|
|
}
|
|
|
|
/**
|
|
* batadv_hash_new() - Allocates and clears the hashtable
|
|
* @size: number of hash buckets to allocate
|
|
*
|
|
* Return: newly allocated hashtable, NULL on errors
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks
|
|
* @hash: hash object to modify
|
|
* @key: lockdep class key address
|
|
*/
|
|
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);
|
|
}
|