sys/ufs/lfs/ulfs_bswap.h

   1 /*      $NetBSD: ulfs_bswap.h,v 1.6 2013/10/18 15:15:22 christos Exp $  */
   2 /*  from NetBSD: ufs_bswap.h,v 1.19 2009/10/19 18:41:17 bouyer 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 u_int16_t
  52 ulfs_rw16(uint16_t a, int ns)
  53 {
  54         return ((ns) ? bswap16(a) : (a));
  55 }
  56
  57 static inline u_int32_t
  58 ulfs_rw32(uint32_t a, int ns)
  59 {
  60         return ((ns) ? bswap32(a) : (a));
  61 }
  62
  63 static inline u_int64_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_ */