1/* $NetBSD: ulfs_bswap.h,v 1.8 2016/06/20 03:29:52 dholland Exp $ */
2/* from NetBSD: ufs_bswap.h,v 1.21 2016/04/29 03:05:04 christos Exp */
3
4/*
5 * Copyright (c) 1998 Manuel Bouyer.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 */
28
29#ifndef _UFS_LFS_ULFS_BSWAP_H_
30#define _UFS_LFS_ULFS_BSWAP_H_
31
32#if defined(_KERNEL_OPT)
33#include "opt_lfs.h"
34#endif
35
36#include <sys/bswap.h>
37
38/* Macros to access ULFS flags */
39#ifdef LFS_EI
40#define ULFS_MPNEEDSWAP(lfs) ((lfs)->um_flags & ULFS_NEEDSWAP)
41#define ULFS_FSNEEDSWAP(fs) ((fs)->fs_flags & FS_SWAPPED)
42#define ULFS_IPNEEDSWAP(ip) ULFS_MPNEEDSWAP((ip)->i_lfs)
43#else
44#define ULFS_MPNEEDSWAP(ump) (__USE(ump), 0)
45#define ULFS_FSNEEDSWAP(fs) (__USE(fs), 0)
46#define ULFS_IPNEEDSWAP(ip) (__USE(ip), 0)
47#endif
48
49#if !defined(_KERNEL) || defined(LFS_EI)
50/* inlines for access to swapped data */
51static inline uint16_t
52ulfs_rw16(uint16_t a, int ns)
53{
54 return ((ns) ? bswap16(a) : (a));
55}
56
57static inline uint32_t
58ulfs_rw32(uint32_t a, int ns)
59{
60 return ((ns) ? bswap32(a) : (a));
61}
62
63static inline uint64_t
64ulfs_rw64(uint64_t a, int ns)
65{
66 return ((ns) ? bswap64(a) : (a));
67}
68#else
69#define ulfs_rw16(a, ns) (__USE(ns), (uint16_t)(a))
70#define ulfs_rw32(a, ns) (__USE(ns), (uint32_t)(a))
71#define ulfs_rw64(a, ns) (__USE(ns), (uint64_t)(a))
72#endif
73
74#define ulfs_add16(a, b, ns) \
75 (a) = ulfs_rw16(ulfs_rw16((a), (ns)) + (b), (ns))
76#define ulfs_add32(a, b, ns) \
77 (a) = ulfs_rw32(ulfs_rw32((a), (ns)) + (b), (ns))
78#define ulfs_add64(a, b, ns) \
79 (a) = ulfs_rw64(ulfs_rw64((a), (ns)) + (b), (ns))
80
81#endif /* !_UFS_LFS_ULFS_BSWAP_H_ */
82