/* * 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 as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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/config.h> #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 */ printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__, errstr); errno = 1; } return -errno; }