minix/sys/ufs/lfs/ulfs_bswap.h

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/* $NetBSD: ulfs_bswap.h,v 1.6 2013/10/18 15:15:22 christos Exp $ */
/* from NetBSD: ufs_bswap.h,v 1.19 2009/10/19 18:41:17 bouyer Exp */
/*
* Copyright (c) 1998 Manuel Bouyer.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef _UFS_LFS_ULFS_BSWAP_H_
#define _UFS_LFS_ULFS_BSWAP_H_
#if defined(_KERNEL_OPT)
#include "opt_lfs.h"
#endif
#include <sys/bswap.h>
/* Macros to access ULFS flags */
#ifdef LFS_EI
#define ULFS_MPNEEDSWAP(lfs) ((lfs)->um_flags & ULFS_NEEDSWAP)
#define ULFS_FSNEEDSWAP(fs) ((fs)->fs_flags & FS_SWAPPED)
#define ULFS_IPNEEDSWAP(ip) ULFS_MPNEEDSWAP((ip)->i_lfs)
#else
#define ULFS_MPNEEDSWAP(ump) (__USE(ump), 0)
#define ULFS_FSNEEDSWAP(fs) (__USE(fs), 0)
#define ULFS_IPNEEDSWAP(ip) (__USE(ip), 0)
#endif
#if !defined(_KERNEL) || defined(LFS_EI)
/* inlines for access to swapped data */
static inline u_int16_t
ulfs_rw16(uint16_t a, int ns)
{
return ((ns) ? bswap16(a) : (a));
}
static inline u_int32_t
ulfs_rw32(uint32_t a, int ns)
{
return ((ns) ? bswap32(a) : (a));
}
static inline u_int64_t
ulfs_rw64(uint64_t a, int ns)
{
return ((ns) ? bswap64(a) : (a));
}
#else
#define ulfs_rw16(a, ns) (__USE(ns), (uint16_t)(a))
#define ulfs_rw32(a, ns) (__USE(ns), (uint32_t)(a))
#define ulfs_rw64(a, ns) (__USE(ns), (uint64_t)(a))
#endif
#define ulfs_add16(a, b, ns) \
(a) = ulfs_rw16(ulfs_rw16((a), (ns)) + (b), (ns))
#define ulfs_add32(a, b, ns) \
(a) = ulfs_rw32(ulfs_rw32((a), (ns)) + (b), (ns))
#define ulfs_add64(a, b, ns) \
(a) = ulfs_rw64(ulfs_rw64((a), (ns)) + (b), (ns))
#endif /* !_UFS_LFS_ULFS_BSWAP_H_ */