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 version 2
15 *  as published by the Free Software Foundation.
16 *
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
30#include <linux/module.h>
31
32#include <linux/list.h>
33#include <linux/jhash.h>
34
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++) {
55		c->namelen = strlen(c->name);
56		bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
57		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
70int v9fs_errstr2errno(char *errstr, int len)
71{
72	int errno = 0;
73	struct hlist_node *p = NULL;
74	struct errormap *c = NULL;
75	int bucket = jhash(errstr, len, 0) % ERRHASHSZ;
76
77	hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
78		if (c->namelen==len && !memcmp(c->name, errstr, len)) {
79			errno = c->val;
80			break;
81		}
82	}
83
84	if (errno == 0) {
85		/* TODO: if error isn't found, add it dynamically */
86		errstr[len] = 0;
87		printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
88		       errstr);
89		errno = 1;
90	}
91
92	return -errno;
93}
94