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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_arch.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/xfs/xfs_arch.h')
-rw-r--r--fs/xfs/xfs_arch.h213
1 files changed, 213 insertions, 0 deletions
diff --git a/fs/xfs/xfs_arch.h b/fs/xfs/xfs_arch.h
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1/*
2 * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32#ifndef __XFS_ARCH_H__
33#define __XFS_ARCH_H__
34
35#ifndef XFS_BIG_INUMS
36# error XFS_BIG_INUMS must be defined true or false
37#endif
38
39#ifdef __KERNEL__
40
41#include <asm/byteorder.h>
42
43#ifdef __LITTLE_ENDIAN
44# define __BYTE_ORDER __LITTLE_ENDIAN
45#endif
46#ifdef __BIG_ENDIAN
47# define __BYTE_ORDER __BIG_ENDIAN
48#endif
49
50#endif /* __KERNEL__ */
51
52/* do we need conversion? */
53
54#define ARCH_NOCONVERT 1
55#if __BYTE_ORDER == __LITTLE_ENDIAN
56# define ARCH_CONVERT 0
57#else
58# define ARCH_CONVERT ARCH_NOCONVERT
59#endif
60
61/* generic swapping macros */
62
63#ifndef HAVE_SWABMACROS
64#define INT_SWAP16(type,var) ((typeof(type))(__swab16((__u16)(var))))
65#define INT_SWAP32(type,var) ((typeof(type))(__swab32((__u32)(var))))
66#define INT_SWAP64(type,var) ((typeof(type))(__swab64((__u64)(var))))
67#endif
68
69#define INT_SWAP(type, var) \
70 ((sizeof(type) == 8) ? INT_SWAP64(type,var) : \
71 ((sizeof(type) == 4) ? INT_SWAP32(type,var) : \
72 ((sizeof(type) == 2) ? INT_SWAP16(type,var) : \
73 (var))))
74
75/*
76 * get and set integers from potentially unaligned locations
77 */
78
79#define INT_GET_UNALIGNED_16_BE(pointer) \
80 ((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))
81#define INT_SET_UNALIGNED_16_BE(pointer,value) \
82 { \
83 ((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
84 ((__u8*)(pointer))[1] = (((value) ) & 0xff); \
85 }
86
87/* define generic INT_ macros */
88
89#define INT_GET(reference,arch) \
90 (((arch) == ARCH_NOCONVERT) \
91 ? \
92 (reference) \
93 : \
94 INT_SWAP((reference),(reference)) \
95 )
96
97/* does not return a value */
98#define INT_SET(reference,arch,valueref) \
99 (__builtin_constant_p(valueref) ? \
100 (void)( (reference) = ( ((arch) != ARCH_NOCONVERT) ? (INT_SWAP((reference),(valueref))) : (valueref)) ) : \
101 (void)( \
102 ((reference) = (valueref)), \
103 ( ((arch) != ARCH_NOCONVERT) ? (reference) = INT_SWAP((reference),(reference)) : 0 ) \
104 ) \
105 )
106
107/* does not return a value */
108#define INT_MOD_EXPR(reference,arch,code) \
109 (((arch) == ARCH_NOCONVERT) \
110 ? \
111 (void)((reference) code) \
112 : \
113 (void)( \
114 (reference) = INT_GET((reference),arch) , \
115 ((reference) code), \
116 INT_SET(reference, arch, reference) \
117 ) \
118 )
119
120/* does not return a value */
121#define INT_MOD(reference,arch,delta) \
122 (void)( \
123 INT_MOD_EXPR(reference,arch,+=(delta)) \
124 )
125
126/*
127 * INT_COPY - copy a value between two locations with the
128 * _same architecture_ but _potentially different sizes_
129 *
130 * if the types of the two parameters are equal or they are
131 * in native architecture, a simple copy is done
132 *
133 * otherwise, architecture conversions are done
134 *
135 */
136
137/* does not return a value */
138#define INT_COPY(dst,src,arch) \
139 ( \
140 ((sizeof(dst) == sizeof(src)) || ((arch) == ARCH_NOCONVERT)) \
141 ? \
142 (void)((dst) = (src)) \
143 : \
144 INT_SET(dst, arch, INT_GET(src, arch)) \
145 )
146
147/*
148 * INT_XLATE - copy a value in either direction between two locations
149 * with different architectures
150 *
151 * dir < 0 - copy from memory to buffer (native to arch)
152 * dir > 0 - copy from buffer to memory (arch to native)
153 */
154
155/* does not return a value */
156#define INT_XLATE(buf,mem,dir,arch) {\
157 ASSERT(dir); \
158 if (dir>0) { \
159 (mem)=INT_GET(buf, arch); \
160 } else { \
161 INT_SET(buf, arch, mem); \
162 } \
163}
164
165/*
166 * In directories inode numbers are stored as unaligned arrays of unsigned
167 * 8bit integers on disk.
168 *
169 * For v1 directories or v2 directories that contain inode numbers that
170 * do not fit into 32bit the array has eight members, but the first member
171 * is always zero:
172 *
173 * |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7|
174 *
175 * For v2 directories that only contain entries with inode numbers that fit
176 * into 32bits a four-member array is used:
177 *
178 * |24-31|16-23| 8-15| 0- 7|
179 */
180
181#define XFS_GET_DIR_INO4(di) \
182 (((u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
183
184#define XFS_PUT_DIR_INO4(from, di) \
185do { \
186 (di).i[0] = (((from) & 0xff000000ULL) >> 24); \
187 (di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \
188 (di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \
189 (di).i[3] = ((from) & 0x000000ffULL); \
190} while (0)
191
192#define XFS_DI_HI(di) \
193 (((u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
194#define XFS_DI_LO(di) \
195 (((u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7]))
196
197#define XFS_GET_DIR_INO8(di) \
198 (((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \
199 ((xfs_ino_t)XFS_DI_HI(di) << 32))
200
201#define XFS_PUT_DIR_INO8(from, di) \
202do { \
203 (di).i[0] = 0; \
204 (di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \
205 (di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \
206 (di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \
207 (di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \
208 (di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \
209 (di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \
210 (di).i[7] = ((from) & 0x00000000000000ffULL); \
211} while (0)
212
213#endif /* __XFS_ARCH_H__ */