Linux kernel mirror (for testing)
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1/*
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
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to:
25 * Free Software Foundation
26 * 51 Franklin Street, Fifth Floor
27 * Boston, MA 02111-1301 USA
28 *
29 */
30
31#include <linux/config.h>
32#include <linux/module.h>
33
34#include <linux/list.h>
35#include <linux/jhash.h>
36
37#include "debug.h"
38#include "error.h"
39
40/**
41 * v9fs_error_init - preload
42 * @errstr: error string
43 *
44 */
45
46int v9fs_error_init(void)
47{
48 struct errormap *c;
49 int bucket;
50
51 /* initialize hash table */
52 for (bucket = 0; bucket < ERRHASHSZ; bucket++)
53 INIT_HLIST_HEAD(&hash_errmap[bucket]);
54
55 /* load initial error map into hash table */
56 for (c = errmap; c->name != NULL; c++) {
57 bucket = jhash(c->name, strlen(c->name), 0) % ERRHASHSZ;
58 INIT_HLIST_NODE(&c->list);
59 hlist_add_head(&c->list, &hash_errmap[bucket]);
60 }
61
62 return 1;
63}
64
65/**
66 * errstr2errno - convert error string to error number
67 * @errstr: error string
68 *
69 */
70
71int v9fs_errstr2errno(char *errstr)
72{
73 int errno = 0;
74 struct hlist_node *p = NULL;
75 struct errormap *c = NULL;
76 int bucket = jhash(errstr, strlen(errstr), 0) % ERRHASHSZ;
77
78 hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
79 if (!strcmp(c->name, errstr)) {
80 errno = c->val;
81 break;
82 }
83 }
84
85 if (errno == 0) {
86 /* TODO: if error isn't found, add it dynamically */
87 printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
88 errstr);
89 errno = 1;
90 }
91
92 return -errno;
93}