1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#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
#ifdef XFS_NATIVE_HOST
#define cpu_to_be16(val) ((__be16)(val))
#define cpu_to_be32(val) ((__be32)(val))
#define cpu_to_be64(val) ((__be64)(val))
#define be16_to_cpu(val) ((__uint16_t)(val)
#define be32_to_cpu(val) ((__uint32_t)(val))
#define be64_to_cpu(val) ((__uint64_t)(val))
#else
#define cpu_to_be16(val) (__swab16((__uint16_t)(val)))
#define cpu_to_be32(val) (__swab32((__uint32_t)(val)))
#define cpu_to_be64(val) (__swab64((__uint64_t)(val)))
#define be16_to_cpu(val) (__swab16((__be16)(val)))
#define be32_to_cpu(val) (__swab32((__be32)(val)))
#define be64_to_cpu(val) (__swab64((__be64)(val)))
#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); \
} \
}
static inline void be16_add(__be16 *a, __s16 b)
{
*a = cpu_to_be16(be16_to_cpu(*a) + b);
}
static inline void be32_add(__be32 *a, __s32 b)
{
*a = cpu_to_be32(be32_to_cpu(*a) + b);
}
static inline void be64_add(__be64 *a, __s64 b)
{
*a = cpu_to_be64(be64_to_cpu(*a) + b);
}
/*
* 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__ */
|
