Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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#include <linux/string.h>
37
38#include "debug.h"
39#include "error.h"
40
41/**
42 * v9fs_error_init - preload
43 * @errstr: error string
44 *
45 */
46
47int v9fs_error_init(void)
48{
49 struct errormap *c;
50 int bucket;
51
52 /* initialize hash table */
53 for (bucket = 0; bucket < ERRHASHSZ; bucket++)
54 INIT_HLIST_HEAD(&hash_errmap[bucket]);
55
56 /* load initial error map into hash table */
57 for (c = errmap; c->name != NULL; c++) {
58 bucket = jhash(c->name, strlen(c->name), 0) % ERRHASHSZ;
59 INIT_HLIST_NODE(&c->list);
60 hlist_add_head(&c->list, &hash_errmap[bucket]);
61 }
62
63 return 1;
64}
65
66/**
67 * errstr2errno - convert error string to error number
68 * @errstr: error string
69 *
70 */
71
72int v9fs_errstr2errno(char *errstr)
73{
74 int errno = 0;
75 struct hlist_node *p = NULL;
76 struct errormap *c = NULL;
77 int bucket = jhash(errstr, strlen(errstr), 0) % ERRHASHSZ;
78
79 hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
80 if (!strcmp(c->name, errstr)) {
81 errno = c->val;
82 break;
83 }
84 }
85
86 if (errno == 0) {
87 /* TODO: if error isn't found, add it dynamically */
88 printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
89 errstr);
90 errno = 1;
91 }
92
93 return -errno;
94}