f5f287738b
Basically, we saw a large amount of time spent in the jfs_strfromUCS_le() function, mispredicting the branch inside the loop, so I just added some unlikely modifiers to the if statements to re-ordered the code. Again, these simple changes provided > 2 % on spec-sfs, so please consider it for inclusion. Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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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
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* the 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 the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include "jfs_incore.h"
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#include "jfs_filsys.h"
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#include "jfs_unicode.h"
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#include "jfs_debug.h"
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/*
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* NAME: jfs_strfromUCS()
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*
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* FUNCTION: Convert little-endian unicode string to character string
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*
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*/
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int jfs_strfromUCS_le(char *to, const __le16 * from,
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int len, struct nls_table *codepage)
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{
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int i;
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int outlen = 0;
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static int warn_again = 5; /* Only warn up to 5 times total */
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int warn = !!warn_again; /* once per string */
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if (codepage) {
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for (i = 0; (i < len) && from[i]; i++) {
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int charlen;
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charlen =
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codepage->uni2char(le16_to_cpu(from[i]),
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&to[outlen],
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NLS_MAX_CHARSET_SIZE);
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if (charlen > 0)
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outlen += charlen;
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else
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to[outlen++] = '?';
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}
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} else {
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for (i = 0; (i < len) && from[i]; i++) {
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if (unlikely(le16_to_cpu(from[i]) & 0xff00)) {
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to[i] = '?';
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if (unlikely(warn)) {
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warn--;
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warn_again--;
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printk(KERN_ERR
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"non-latin1 character 0x%x found in JFS file name\n",
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le16_to_cpu(from[i]));
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printk(KERN_ERR
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"mount with iocharset=utf8 to access\n");
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}
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}
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else
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to[i] = (char) (le16_to_cpu(from[i]));
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}
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outlen = i;
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}
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to[outlen] = 0;
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return outlen;
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}
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/*
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* NAME: jfs_strtoUCS()
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*
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* FUNCTION: Convert character string to unicode string
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*
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*/
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static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len,
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struct nls_table *codepage)
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{
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int charlen;
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int i;
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if (codepage) {
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for (i = 0; len && *from; i++, from += charlen, len -= charlen)
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{
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charlen = codepage->char2uni(from, len, &to[i]);
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if (charlen < 1) {
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jfs_err("jfs_strtoUCS: char2uni returned %d.",
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charlen);
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jfs_err("charset = %s, char = 0x%x",
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codepage->charset, *from);
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return charlen;
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}
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}
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} else {
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for (i = 0; (i < len) && from[i]; i++)
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to[i] = (wchar_t) from[i];
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}
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to[i] = 0;
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return i;
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}
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/*
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* NAME: get_UCSname()
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*
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* FUNCTION: Allocate and translate to unicode string
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*
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*/
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int get_UCSname(struct component_name * uniName, struct dentry *dentry)
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{
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struct nls_table *nls_tab = JFS_SBI(dentry->d_sb)->nls_tab;
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int length = dentry->d_name.len;
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if (length > JFS_NAME_MAX)
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return -ENAMETOOLONG;
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uniName->name =
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kmalloc((length + 1) * sizeof(wchar_t), GFP_NOFS);
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if (uniName->name == NULL)
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return -ENOSPC;
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uniName->namlen = jfs_strtoUCS(uniName->name, dentry->d_name.name,
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length, nls_tab);
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if (uniName->namlen < 0) {
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kfree(uniName->name);
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return uniName->namlen;
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}
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return 0;
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}
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