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      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
     52 ulfs_rw16(uint16_t a, int ns)
     53 {
     54 	return ((ns) ? bswap16(a) : (a));
     55 }
     56 
     57 static __inline uint32_t
     58 ulfs_rw32(uint32_t a, int ns)
     59 {
     60 	return ((ns) ? bswap32(a) : (a));
     61 }
     62 
     63 static __inline uint64_t
     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