1 /*
2 * Copyright (C) 2006-2012 B.A.T.M.A.N. contributors:
3 *
4 * Simon Wunderlich, Marek Lindner
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA
19 *
20 */
21
22 #include "main.h"
23 #include "hash.h"
24
25 /* clears the hash */
hash_init(struct hashtable_t * hash)26 static void hash_init(struct hashtable_t *hash)
27 {
28 uint32_t i;
29
30 for (i = 0 ; i < hash->size; i++) {
31 INIT_HLIST_HEAD(&hash->table[i]);
32 spin_lock_init(&hash->list_locks[i]);
33 }
34 }
35
36 /* free only the hashtable and the hash itself. */
hash_destroy(struct hashtable_t * hash)37 void hash_destroy(struct hashtable_t *hash)
38 {
39 kfree(hash->list_locks);
40 kfree(hash->table);
41 kfree(hash);
42 }
43
44 /* allocates and clears the hash */
hash_new(uint32_t size)45 struct hashtable_t *hash_new(uint32_t size)
46 {
47 struct hashtable_t *hash;
48
49 hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
50 if (!hash)
51 return NULL;
52
53 hash->table = kmalloc(sizeof(*hash->table) * size, GFP_ATOMIC);
54 if (!hash->table)
55 goto free_hash;
56
57 hash->list_locks = kmalloc(sizeof(*hash->list_locks) * size,
58 GFP_ATOMIC);
59 if (!hash->list_locks)
60 goto free_table;
61
62 hash->size = size;
63 hash_init(hash);
64 return hash;
65
66 free_table:
67 kfree(hash->table);
68 free_hash:
69 kfree(hash);
70 return NULL;
71 }
72