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3ed8491c EVH |
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 | |
42e8c509 EVH |
14 | * it under the terms of the GNU General Public License version 2 |
15 | * as published by the Free Software Foundation. | |
3ed8491c EVH |
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/config.h> | |
31 | #include <linux/module.h> | |
32 | ||
33 | #include <linux/list.h> | |
34 | #include <linux/jhash.h> | |
35 | ||
36 | #include "debug.h" | |
37 | #include "error.h" | |
38 | ||
39 | /** | |
40 | * v9fs_error_init - preload | |
41 | * @errstr: error string | |
42 | * | |
43 | */ | |
44 | ||
45 | int v9fs_error_init(void) | |
46 | { | |
47 | struct errormap *c; | |
48 | int bucket; | |
49 | ||
50 | /* initialize hash table */ | |
51 | for (bucket = 0; bucket < ERRHASHSZ; bucket++) | |
52 | INIT_HLIST_HEAD(&hash_errmap[bucket]); | |
53 | ||
54 | /* load initial error map into hash table */ | |
55 | for (c = errmap; c->name != NULL; c++) { | |
531b1094 LI |
56 | c->namelen = strlen(c->name); |
57 | bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ; | |
3ed8491c EVH |
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 | ||
531b1094 | 71 | int v9fs_errstr2errno(char *errstr, int len) |
3ed8491c EVH |
72 | { |
73 | int errno = 0; | |
74 | struct hlist_node *p = NULL; | |
75 | struct errormap *c = NULL; | |
531b1094 | 76 | int bucket = jhash(errstr, len, 0) % ERRHASHSZ; |
3ed8491c EVH |
77 | |
78 | hlist_for_each_entry(c, p, &hash_errmap[bucket], list) { | |
531b1094 | 79 | if (c->namelen==len && !memcmp(c->name, errstr, len)) { |
3ed8491c EVH |
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 | } |