531b1094b7
Performance enhancement reducing the number of copies in the data and stat paths. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Cc: Eric Van Hensbergen <ericvh@ericvh.myip.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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* linux/fs/9p/error.c
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*
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* Error string handling
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*
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* Plan 9 uses error strings, Unix uses error numbers. These functions
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* try to help manage that and provide for dynamically adding error
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* mappings.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/jhash.h>
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#include "debug.h"
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#include "error.h"
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/**
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* v9fs_error_init - preload
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* @errstr: error string
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*
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*/
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int v9fs_error_init(void)
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{
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struct errormap *c;
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int bucket;
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/* initialize hash table */
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for (bucket = 0; bucket < ERRHASHSZ; bucket++)
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INIT_HLIST_HEAD(&hash_errmap[bucket]);
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/* load initial error map into hash table */
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for (c = errmap; c->name != NULL; c++) {
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c->namelen = strlen(c->name);
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bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
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INIT_HLIST_NODE(&c->list);
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hlist_add_head(&c->list, &hash_errmap[bucket]);
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}
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return 1;
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}
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/**
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* errstr2errno - convert error string to error number
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* @errstr: error string
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*
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*/
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int v9fs_errstr2errno(char *errstr, int len)
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{
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int errno = 0;
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struct hlist_node *p = NULL;
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struct errormap *c = NULL;
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int bucket = jhash(errstr, len, 0) % ERRHASHSZ;
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hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
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if (c->namelen==len && !memcmp(c->name, errstr, len)) {
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errno = c->val;
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break;
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}
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}
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if (errno == 0) {
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/* TODO: if error isn't found, add it dynamically */
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printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
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errstr);
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errno = 1;
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}
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return -errno;
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}
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