/* * linux/fs/9p/error.c * * Error string handling * * Plan 9 uses error strings, Unix uses error numbers.  These functions * try to help manage that and provide for dynamically adding error * mappings. * *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License version 2 *  as published by the Free Software Foundation. * *  This program is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY; without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *  GNU General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with this program; if not, write to: *  Free Software Foundation *  51 Franklin Street, Fifth Floor *  Boston, MA  02111-1301  USA * */ #include <linux/module.h> #include <linux/list.h>#include <linux/jhash.h> #include "debug.h"#include "error.h" /** * v9fs_error_init - preload * @errstr: error string * */ int v9fs_error_init(void){	struct errormap *c;	int bucket; 	/* initialize hash table */	for (bucket = 0; bucket < ERRHASHSZ; bucket++)		INIT_HLIST_HEAD(&hash_errmap[bucket]); 	/* load initial error map into hash table */	for (c = errmap; c->name != NULL; c++) {		c->namelen = strlen(c->name);		bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;		INIT_HLIST_NODE(&c->list);		hlist_add_head(&c->list, &hash_errmap[bucket]);	} 	return 1;} /** * errstr2errno - convert error string to error number * @errstr: error string * */ int v9fs_errstr2errno(char *errstr, int len){	int errno = 0;	struct hlist_node *p = NULL;	struct errormap *c = NULL;	int bucket = jhash(errstr, len, 0) % ERRHASHSZ; 	hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {		if (c->namelen==len && !memcmp(c->name, errstr, len)) {			errno = c->val;			break;		}	} 	if (errno == 0) {		/* TODO: if error isn't found, add it dynamically */		errstr[len] = 0;		printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,		       errstr);		errno = 1;	} 	return -errno;}