f016bad6be
Christoph). SGI-PV: 942400 SGI-Modid: xfs-linux-melb:xfs-kern:23771a Signed-off-by: Nathan Scott <nathans@sgi.com>
219 lines
6.2 KiB
C
219 lines
6.2 KiB
C
/*
|
|
* Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of version 2 of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* Further, this software is distributed without any warranty that it is
|
|
* free of the rightful claim of any third person regarding infringement
|
|
* or the like. Any license provided herein, whether implied or
|
|
* otherwise, applies only to this software file. Patent licenses, if
|
|
* any, provided herein do not apply to combinations of this program with
|
|
* other software, or any other product whatsoever.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write the Free Software Foundation, Inc., 59
|
|
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
|
*
|
|
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
|
|
* Mountain View, CA 94043, or:
|
|
*
|
|
* http://www.sgi.com
|
|
*
|
|
* For further information regarding this notice, see:
|
|
*
|
|
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
|
|
*/
|
|
#ifndef __XFS_ARCH_H__
|
|
#define __XFS_ARCH_H__
|
|
|
|
#ifndef XFS_BIG_INUMS
|
|
# error XFS_BIG_INUMS must be defined true or false
|
|
#endif
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/byteorder.h>
|
|
|
|
#ifdef __BIG_ENDIAN
|
|
#define XFS_NATIVE_HOST 1
|
|
#else
|
|
#undef XFS_NATIVE_HOST
|
|
#endif
|
|
|
|
#else /* __KERNEL__ */
|
|
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
#define XFS_NATIVE_HOST 1
|
|
#else
|
|
#undef XFS_NATIVE_HOST
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
/* do we need conversion? */
|
|
#define ARCH_NOCONVERT 1
|
|
#ifdef XFS_NATIVE_HOST
|
|
# define ARCH_CONVERT ARCH_NOCONVERT
|
|
#else
|
|
# define ARCH_CONVERT 0
|
|
#endif
|
|
|
|
/* generic swapping macros */
|
|
|
|
#ifndef HAVE_SWABMACROS
|
|
#define INT_SWAP16(type,var) ((typeof(type))(__swab16((__u16)(var))))
|
|
#define INT_SWAP32(type,var) ((typeof(type))(__swab32((__u32)(var))))
|
|
#define INT_SWAP64(type,var) ((typeof(type))(__swab64((__u64)(var))))
|
|
#endif
|
|
|
|
#define INT_SWAP(type, var) \
|
|
((sizeof(type) == 8) ? INT_SWAP64(type,var) : \
|
|
((sizeof(type) == 4) ? INT_SWAP32(type,var) : \
|
|
((sizeof(type) == 2) ? INT_SWAP16(type,var) : \
|
|
(var))))
|
|
|
|
/*
|
|
* get and set integers from potentially unaligned locations
|
|
*/
|
|
|
|
#define INT_GET_UNALIGNED_16_BE(pointer) \
|
|
((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))
|
|
#define INT_SET_UNALIGNED_16_BE(pointer,value) \
|
|
{ \
|
|
((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
|
|
((__u8*)(pointer))[1] = (((value) ) & 0xff); \
|
|
}
|
|
|
|
/* define generic INT_ macros */
|
|
|
|
#define INT_GET(reference,arch) \
|
|
(((arch) == ARCH_NOCONVERT) \
|
|
? \
|
|
(reference) \
|
|
: \
|
|
INT_SWAP((reference),(reference)) \
|
|
)
|
|
|
|
/* does not return a value */
|
|
#define INT_SET(reference,arch,valueref) \
|
|
(__builtin_constant_p(valueref) ? \
|
|
(void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \
|
|
(void)( \
|
|
((reference) = (valueref)), \
|
|
( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
|
|
) \
|
|
)
|
|
|
|
/* does not return a value */
|
|
#define INT_MOD_EXPR(reference,arch,code) \
|
|
(((arch) == ARCH_NOCONVERT) \
|
|
? \
|
|
(void)((reference) code) \
|
|
: \
|
|
(void)( \
|
|
(reference) = INT_GET((reference),arch) , \
|
|
((reference) code), \
|
|
INT_SET(reference, arch, reference) \
|
|
) \
|
|
)
|
|
|
|
/* does not return a value */
|
|
#define INT_MOD(reference,arch,delta) \
|
|
(void)( \
|
|
INT_MOD_EXPR(reference,arch,+=(delta)) \
|
|
)
|
|
|
|
/*
|
|
* INT_COPY - copy a value between two locations with the
|
|
* _same architecture_ but _potentially different sizes_
|
|
*
|
|
* if the types of the two parameters are equal or they are
|
|
* in native architecture, a simple copy is done
|
|
*
|
|
* otherwise, architecture conversions are done
|
|
*
|
|
*/
|
|
|
|
/* does not return a value */
|
|
#define INT_COPY(dst,src,arch) \
|
|
( \
|
|
((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \
|
|
? \
|
|
(void)((dst) = (src)) \
|
|
: \
|
|
INT_SET(dst, arch, INT_GET(src, arch)) \
|
|
)
|
|
|
|
/*
|
|
* INT_XLATE - copy a value in either direction between two locations
|
|
* with different architectures
|
|
*
|
|
* dir < 0 - copy from memory to buffer (native to arch)
|
|
* dir > 0 - copy from buffer to memory (arch to native)
|
|
*/
|
|
|
|
/* does not return a value */
|
|
#define INT_XLATE(buf,mem,dir,arch) {\
|
|
ASSERT(dir); \
|
|
if (dir>0) { \
|
|
(mem)=INT_GET(buf, arch); \
|
|
} else { \
|
|
INT_SET(buf, arch, mem); \
|
|
} \
|
|
}
|
|
|
|
/*
|
|
* In directories inode numbers are stored as unaligned arrays of unsigned
|
|
* 8bit integers on disk.
|
|
*
|
|
* For v1 directories or v2 directories that contain inode numbers that
|
|
* do not fit into 32bit the array has eight members, but the first member
|
|
* is always zero:
|
|
*
|
|
* |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7|
|
|
*
|
|
* For v2 directories that only contain entries with inode numbers that fit
|
|
* into 32bits a four-member array is used:
|
|
*
|
|
* |24-31|16-23| 8-15| 0- 7|
|
|
*/
|
|
|
|
#define XFS_GET_DIR_INO4(di) \
|
|
(((u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
|
|
|
|
#define XFS_PUT_DIR_INO4(from, di) \
|
|
do { \
|
|
(di).i[0] = (((from) & 0xff000000ULL) >> 24); \
|
|
(di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \
|
|
(di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \
|
|
(di).i[3] = ((from) & 0x000000ffULL); \
|
|
} while (0)
|
|
|
|
#define XFS_DI_HI(di) \
|
|
(((u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
|
|
#define XFS_DI_LO(di) \
|
|
(((u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7]))
|
|
|
|
#define XFS_GET_DIR_INO8(di) \
|
|
(((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \
|
|
((xfs_ino_t)XFS_DI_HI(di) << 32))
|
|
|
|
#define XFS_PUT_DIR_INO8(from, di) \
|
|
do { \
|
|
(di).i[0] = 0; \
|
|
(di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \
|
|
(di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \
|
|
(di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \
|
|
(di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \
|
|
(di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \
|
|
(di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \
|
|
(di).i[7] = ((from) & 0x00000000000000ffULL); \
|
|
} while (0)
|
|
|
|
#endif /* __XFS_ARCH_H__ */
|