70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* Copyright (C) 2006-2011 B.A.T.M.A.N. contributors:
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*
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* Simon Wunderlich, Marek Lindner
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#include "main.h"
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#include "hash.h"
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/* clears the hash */
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static void hash_init(struct hashtable_t *hash)
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{
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int i;
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for (i = 0 ; i < hash->size; i++) {
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INIT_HLIST_HEAD(&hash->table[i]);
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spin_lock_init(&hash->list_locks[i]);
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}
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}
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/* free only the hashtable and the hash itself. */
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void hash_destroy(struct hashtable_t *hash)
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{
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kfree(hash->list_locks);
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kfree(hash->table);
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kfree(hash);
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}
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/* allocates and clears the hash */
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struct hashtable_t *hash_new(int size)
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{
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struct hashtable_t *hash;
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hash = kmalloc(sizeof(struct hashtable_t), GFP_ATOMIC);
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if (!hash)
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return NULL;
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hash->table = kmalloc(sizeof(struct element_t *) * size, GFP_ATOMIC);
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if (!hash->table)
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goto free_hash;
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hash->list_locks = kmalloc(sizeof(spinlock_t) * size, GFP_ATOMIC);
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if (!hash->list_locks)
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goto free_table;
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hash->size = size;
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hash_init(hash);
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return hash;
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free_table:
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kfree(hash->table);
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free_hash:
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kfree(hash);
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return NULL;
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}
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