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