blob: ae91555c155894be0b0118bc075e095ae01b5262 [file] [log] [blame]
Eric Van Hensbergen3ed84912005-09-09 13:04:24 -07001/*
2 * linux/fs/9p/error.c
3 *
4 * Error string handling
5 *
6 * Plan 9 uses error strings, Unix uses error numbers. These functions
7 * try to help manage that and provide for dynamically adding error
8 * mappings.
9 *
10 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
11 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
12 *
13 * This program is free software; you can redistribute it and/or modify
Eric Van Hensbergen42e8c502006-03-25 03:07:28 -080014 * it under the terms of the GNU General Public License version 2
15 * as published by the Free Software Foundation.
Eric Van Hensbergen3ed84912005-09-09 13:04:24 -070016 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to:
24 * Free Software Foundation
25 * 51 Franklin Street, Fifth Floor
26 * Boston, MA 02111-1301 USA
27 *
28 */
29
Eric Van Hensbergen3ed84912005-09-09 13:04:24 -070030#include <linux/module.h>
31
32#include <linux/list.h>
33#include <linux/jhash.h>
Eric Van Hensbergen3ed84912005-09-09 13:04:24 -070034
35#include "debug.h"
36#include "error.h"
37
38/**
39 * v9fs_error_init - preload
40 * @errstr: error string
41 *
42 */
43
44int v9fs_error_init(void)
45{
46 struct errormap *c;
47 int bucket;
48
49 /* initialize hash table */
50 for (bucket = 0; bucket < ERRHASHSZ; bucket++)
51 INIT_HLIST_HEAD(&hash_errmap[bucket]);
52
53 /* load initial error map into hash table */
54 for (c = errmap; c->name != NULL; c++) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -080055 c->namelen = strlen(c->name);
56 bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
Eric Van Hensbergen3ed84912005-09-09 13:04:24 -070057 INIT_HLIST_NODE(&c->list);
58 hlist_add_head(&c->list, &hash_errmap[bucket]);
59 }
60
61 return 1;
62}
63
64/**
65 * errstr2errno - convert error string to error number
66 * @errstr: error string
67 *
68 */
69
Latchesar Ionkov531b1092006-01-08 01:05:00 -080070int v9fs_errstr2errno(char *errstr, int len)
Eric Van Hensbergen3ed84912005-09-09 13:04:24 -070071{
72 int errno = 0;
73 struct hlist_node *p = NULL;
74 struct errormap *c = NULL;
Latchesar Ionkov531b1092006-01-08 01:05:00 -080075 int bucket = jhash(errstr, len, 0) % ERRHASHSZ;
Eric Van Hensbergen3ed84912005-09-09 13:04:24 -070076
77 hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -080078 if (c->namelen==len && !memcmp(c->name, errstr, len)) {
Eric Van Hensbergen3ed84912005-09-09 13:04:24 -070079 errno = c->val;
80 break;
81 }
82 }
83
84 if (errno == 0) {
85 /* TODO: if error isn't found, add it dynamically */
86 printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
87 errstr);
88 errno = 1;
89 }
90
91 return -errno;
92}