1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) many different people.
6 * If you wrote this, please acknowledge your work.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
29 #define HASH_SIZE 311 /* Should be prime */
30 #define hash_inode(i) ((i) % HASH_SIZE)
32 typedef struct ino_dev_hash_bucket_struct {
33 struct ino_dev_hash_bucket_struct *next;
37 } ino_dev_hashtable_bucket_t;
39 static ino_dev_hashtable_bucket_t *ino_dev_hashtable[HASH_SIZE];
42 * Return 1 if statbuf->st_ino && statbuf->st_dev are recorded in
43 * `ino_dev_hashtable', else return 0
45 * If NAME is a non-NULL pointer to a character pointer, and there is
46 * a match, then set *NAME to the value of the name slot in that
49 int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name)
51 ino_dev_hashtable_bucket_t *bucket;
53 bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
54 while (bucket != NULL) {
55 if ((bucket->ino == statbuf->st_ino) &&
56 (bucket->dev == statbuf->st_dev))
58 if (name) *name = bucket->name;
61 bucket = bucket->next;
66 /* Add statbuf to statbuf hash table */
67 void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
71 ino_dev_hashtable_bucket_t *bucket;
73 i = hash_inode(statbuf->st_ino);
74 s = name ? strlen(name) : 0;
75 bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + s);
76 bucket->ino = statbuf->st_ino;
77 bucket->dev = statbuf->st_dev;
79 strcpy(bucket->name, name);
81 bucket->name[0] = '\0';
82 bucket->next = ino_dev_hashtable[i];
83 ino_dev_hashtable[i] = bucket;
86 #ifdef CONFIG_FEATURE_CLEAN_UP
87 /* Clear statbuf hash table */
88 void reset_ino_dev_hashtable(void)
91 ino_dev_hashtable_bucket_t *bucket;
93 for (i = 0; i < HASH_SIZE; i++) {
94 while (ino_dev_hashtable[i] != NULL) {
95 bucket = ino_dev_hashtable[i]->next;
96 free(ino_dev_hashtable[i]);
97 ino_dev_hashtable[i] = bucket;
107 c-file-style: "linux"