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      1  1.30  dholland /*	$NetBSD: lfs_cksum.c,v 1.30 2015/08/02 18:18:10 dholland Exp $	*/
      2   1.2       cgd 
      3   1.1   mycroft /*-
      4  1.21  perseant  * Copyright (c) 1999, 2000, 2001, 2002 The NetBSD Foundation, Inc.
      5  1.10  perseant  * All rights reserved.
      6  1.10  perseant  *
      7  1.10  perseant  * This code is derived from software contributed to The NetBSD Foundation
      8  1.10  perseant  * by Konrad E. Schroder <perseant (at) hhhh.org>.
      9  1.10  perseant  *
     10  1.10  perseant  * Redistribution and use in source and binary forms, with or without
     11  1.10  perseant  * modification, are permitted provided that the following conditions
     12  1.10  perseant  * are met:
     13  1.10  perseant  * 1. Redistributions of source code must retain the above copyright
     14  1.10  perseant  *    notice, this list of conditions and the following disclaimer.
     15  1.10  perseant  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.10  perseant  *    notice, this list of conditions and the following disclaimer in the
     17  1.10  perseant  *    documentation and/or other materials provided with the distribution.
     18  1.10  perseant  *
     19  1.10  perseant  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.10  perseant  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.10  perseant  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.10  perseant  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.10  perseant  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.10  perseant  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.10  perseant  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.10  perseant  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.10  perseant  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.10  perseant  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.10  perseant  * POSSIBILITY OF SUCH DAMAGE.
     30  1.10  perseant  */
     31  1.10  perseant /*-
     32   1.1   mycroft  * Copyright (c) 1991, 1993
     33   1.1   mycroft  *	The Regents of the University of California.  All rights reserved.
     34   1.1   mycroft  *
     35   1.1   mycroft  * Redistribution and use in source and binary forms, with or without
     36   1.1   mycroft  * modification, are permitted provided that the following conditions
     37   1.1   mycroft  * are met:
     38   1.1   mycroft  * 1. Redistributions of source code must retain the above copyright
     39   1.1   mycroft  *    notice, this list of conditions and the following disclaimer.
     40   1.1   mycroft  * 2. Redistributions in binary form must reproduce the above copyright
     41   1.1   mycroft  *    notice, this list of conditions and the following disclaimer in the
     42   1.1   mycroft  *    documentation and/or other materials provided with the distribution.
     43  1.23       agc  * 3. Neither the name of the University nor the names of its contributors
     44   1.1   mycroft  *    may be used to endorse or promote products derived from this software
     45   1.1   mycroft  *    without specific prior written permission.
     46   1.1   mycroft  *
     47   1.1   mycroft  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     48   1.1   mycroft  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     49   1.1   mycroft  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     50   1.1   mycroft  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     51   1.1   mycroft  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     52   1.1   mycroft  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     53   1.1   mycroft  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     54   1.1   mycroft  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     55   1.1   mycroft  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     56   1.1   mycroft  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     57   1.1   mycroft  * SUCH DAMAGE.
     58   1.1   mycroft  *
     59   1.4   mycroft  *	@(#)lfs_cksum.c	8.2 (Berkeley) 10/9/94
     60   1.1   mycroft  */
     61  1.18     lukem 
     62  1.18     lukem #include <sys/cdefs.h>
     63  1.30  dholland __KERNEL_RCSID(0, "$NetBSD: lfs_cksum.c,v 1.30 2015/08/02 18:18:10 dholland Exp $");
     64   1.1   mycroft 
     65   1.9        pk #include <sys/param.h>
     66   1.6  christos #ifdef _KERNEL
     67  1.11  perseant # include <sys/systm.h>
     68  1.11  perseant # include <sys/lock.h>
     69  1.11  perseant #else
     70  1.11  perseant # include <stddef.h>
     71   1.9        pk #endif
     72   1.9        pk #include <sys/mount.h>
     73   1.9        pk #include <ufs/lfs/lfs.h>
     74  1.20  perseant #include <ufs/lfs/lfs_extern.h>
     75   1.1   mycroft 
     76   1.1   mycroft /*
     77   1.1   mycroft  * Simple, general purpose, fast checksum.  Data must be short-aligned.
     78   1.1   mycroft  * Returns a u_long in case we ever want to do something more rigorous.
     79   1.1   mycroft  *
     80   1.1   mycroft  * XXX
     81   1.1   mycroft  * Use the TCP/IP checksum instead.
     82   1.1   mycroft  */
     83  1.14  perseant u_int32_t
     84  1.24      yamt lfs_cksum_part(void *str, size_t len, u_int32_t sum)
     85   1.1   mycroft {
     86  1.25     perry 
     87  1.14  perseant 	len &= ~(sizeof(u_int16_t) - 1);
     88  1.24      yamt 	for (; len; len -= sizeof(u_int16_t)) {
     89  1.14  perseant 		sum ^= *(u_int16_t *)str;
     90  1.14  perseant 		str = (void *)((u_int16_t *)str + 1);
     91   1.1   mycroft 	}
     92   1.1   mycroft 	return (sum);
     93   1.9        pk }
     94   1.9        pk 
     95  1.14  perseant u_int32_t
     96  1.24      yamt cksum(void *str, size_t len)
     97  1.24      yamt {
     98  1.24      yamt 
     99  1.24      yamt 	return lfs_cksum_fold(lfs_cksum_part(str, len, 0));
    100  1.24      yamt }
    101  1.24      yamt 
    102  1.24      yamt u_int32_t
    103  1.30  dholland lfs_sb_cksum(struct lfs *fs)
    104   1.9        pk {
    105  1.30  dholland 	void *ptr;
    106  1.25     perry 	size_t size;
    107  1.25     perry 
    108  1.30  dholland 	if (fs->lfs_is64) {
    109  1.30  dholland 		ptr = &fs->lfs_dlfs_u.u_64;
    110  1.30  dholland 		size = (size_t)offsetof(struct dlfs64, dlfs_cksum);
    111  1.30  dholland 	} else {
    112  1.30  dholland 		ptr = &fs->lfs_dlfs_u.u_32;
    113  1.30  dholland 		size = (size_t)offsetof(struct dlfs64, dlfs_cksum);
    114  1.30  dholland 	}
    115  1.30  dholland 
    116  1.30  dholland 	return cksum(ptr, size);
    117   1.1   mycroft }
    118