1 /* $NetBSD: ulfs_bswap.h,v 1.9 2018/04/19 21:50:10 christos 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 */
51 static __inline uint16_t
ulfs_rw16(uint16_t a,int ns)52 ulfs_rw16(uint16_t a, int ns)
53 {
54 return ((ns) ? bswap16(a) : (a));
55 }
56
57 static __inline uint32_t
ulfs_rw32(uint32_t a,int ns)58 ulfs_rw32(uint32_t a, int ns)
59 {
60 return ((ns) ? bswap32(a) : (a));
61 }
62
63 static __inline uint64_t
ulfs_rw64(uint64_t a,int ns)64 ulfs_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