| 1 | /* Copyright (C) 2006-2016 B.A.T.M.A.N. contributors: |
| 2 | * |
| 3 | * Simon Wunderlich, Marek Lindner |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of version 2 of the GNU General Public |
| 7 | * License as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include "hash.h" |
| 19 | #include "main.h" |
| 20 | |
| 21 | #include <linux/fs.h> |
| 22 | #include <linux/lockdep.h> |
| 23 | #include <linux/slab.h> |
| 24 | |
| 25 | /* clears the hash */ |
| 26 | static void batadv_hash_init(struct batadv_hashtable *hash) |
| 27 | { |
| 28 | u32 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. */ |
| 37 | void batadv_hash_destroy(struct batadv_hashtable *hash) |
| 38 | { |
| 39 | kfree(hash->list_locks); |
| 40 | kfree(hash->table); |
| 41 | kfree(hash); |
| 42 | } |
| 43 | |
| 44 | /* allocates and clears the hash */ |
| 45 | struct batadv_hashtable *batadv_hash_new(u32 size) |
| 46 | { |
| 47 | struct batadv_hashtable *hash; |
| 48 | |
| 49 | hash = kmalloc(sizeof(*hash), GFP_ATOMIC); |
| 50 | if (!hash) |
| 51 | return NULL; |
| 52 | |
| 53 | hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC); |
| 54 | if (!hash->table) |
| 55 | goto free_hash; |
| 56 | |
| 57 | hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks), |
| 58 | GFP_ATOMIC); |
| 59 | if (!hash->list_locks) |
| 60 | goto free_table; |
| 61 | |
| 62 | hash->size = size; |
| 63 | batadv_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 | |
| 73 | void batadv_hash_set_lock_class(struct batadv_hashtable *hash, |
| 74 | struct lock_class_key *key) |
| 75 | { |
| 76 | u32 i; |
| 77 | |
| 78 | for (i = 0; i < hash->size; i++) |
| 79 | lockdep_set_class(&hash->list_locks[i], key); |
| 80 | } |