1 /* $NetBSD: lfs_cksum.c,v 1.30 2015/08/02 18:18:10 dholland Exp $ */
4 * Copyright (c) 1999, 2000, 2001, 2002 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Konrad E. Schroder <perseant@hhhh.org>.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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32 * Copyright (c) 1991, 1993
33 * The Regents of the University of California. All rights reserved.
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36 * modification, are permitted provided that the following conditions
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
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52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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59 * @(#)lfs_cksum.c 8.2 (Berkeley) 10/9/94
62 #include <sys/cdefs.h>
63 __KERNEL_RCSID(0, "$NetBSD: lfs_cksum.c,v 1.30 2015/08/02 18:18:10 dholland Exp $");
65 #include <sys/param.h>
67 # include <sys/systm.h>
68 # include <sys/lock.h>
72 #include <sys/mount.h>
73 #include <ufs/lfs/lfs.h>
74 #include <ufs/lfs/lfs_extern.h>
77 * Simple, general purpose, fast checksum. Data must be short-aligned.
78 * Returns a u_long in case we ever want to do something more rigorous.
81 * Use the TCP/IP checksum instead.
84 lfs_cksum_part(void *str
, size_t len
, u_int32_t sum
)
87 len
&= ~(sizeof(u_int16_t
) - 1);
88 for (; len
; len
-= sizeof(u_int16_t
)) {
89 sum
^= *(u_int16_t
*)str
;
90 str
= (void *)((u_int16_t
*)str
+ 1);
96 cksum(void *str
, size_t len
)
99 return lfs_cksum_fold(lfs_cksum_part(str
, len
, 0));
103 lfs_sb_cksum(struct lfs
*fs
)
109 ptr
= &fs
->lfs_dlfs_u
.u_64
;
110 size
= (size_t)offsetof(struct dlfs64
, dlfs_cksum
);
112 ptr
= &fs
->lfs_dlfs_u
.u_32
;
113 size
= (size_t)offsetof(struct dlfs64
, dlfs_cksum
);
116 return cksum(ptr
, size
);