tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#ifndef __XFS_ARCH_H__
19#define __XFS_ARCH_H__
20
21#ifndef XFS_BIG_INUMS
22# error XFS_BIG_INUMS must be defined true or false
23#endif
24
25#ifdef __KERNEL__
26
27#include <asm/byteorder.h>
28
29#ifdef __BIG_ENDIAN
30#define XFS_NATIVE_HOST 1
31#else
32#undef XFS_NATIVE_HOST
33#endif
34
35#else /* __KERNEL__ */
36
37#if __BYTE_ORDER == __BIG_ENDIAN
38#define XFS_NATIVE_HOST 1
39#else
40#undef XFS_NATIVE_HOST
41#endif
42
43#ifdef XFS_NATIVE_HOST
44#define cpu_to_be16(val) ((__force __be16)(__u16)(val))
45#define cpu_to_be32(val) ((__force __be32)(__u32)(val))
46#define cpu_to_be64(val) ((__force __be64)(__u64)(val))
47#define be16_to_cpu(val) ((__force __u16)(__be16)(val))
48#define be32_to_cpu(val) ((__force __u32)(__be32)(val))
49#define be64_to_cpu(val) ((__force __u64)(__be64)(val))
50#else
51#define cpu_to_be16(val) ((__force __be16)__swab16((__u16)(val)))
52#define cpu_to_be32(val) ((__force __be32)__swab32((__u32)(val)))
53#define cpu_to_be64(val) ((__force __be64)__swab64((__u64)(val)))
54#define be16_to_cpu(val) (__swab16((__force __u16)(__be16)(val)))
55#define be32_to_cpu(val) (__swab32((__force __u32)(__be32)(val)))
56#define be64_to_cpu(val) (__swab64((__force __u64)(__be64)(val)))
57#endif
58
59static inline void be16_add_cpu(__be16 *a, __s16 b)
60{
61 *a = cpu_to_be16(be16_to_cpu(*a) + b);
62}
63
64static inline void be32_add_cpu(__be32 *a, __s32 b)
65{
66 *a = cpu_to_be32(be32_to_cpu(*a) + b);
67}
68
69static inline void be64_add_cpu(__be64 *a, __s64 b)
70{
71 *a = cpu_to_be64(be64_to_cpu(*a) + b);
72}
73
74#endif /* __KERNEL__ */
75
76/*
77 * get and set integers from potentially unaligned locations
78 */
79
80#define INT_GET_UNALIGNED_16_BE(pointer) \
81 ((__u16)((((__u8*)(pointer))[0] << 8) | (((__u8*)(pointer))[1])))
82#define INT_SET_UNALIGNED_16_BE(pointer,value) \
83 { \
84 ((__u8*)(pointer))[0] = (((value) >> 8) & 0xff); \
85 ((__u8*)(pointer))[1] = (((value) ) & 0xff); \
86 }
87
88/*
89 * In directories inode numbers are stored as unaligned arrays of unsigned
90 * 8bit integers on disk.
91 *
92 * For v1 directories or v2 directories that contain inode numbers that
93 * do not fit into 32bit the array has eight members, but the first member
94 * is always zero:
95 *
96 * |unused|48-55|40-47|32-39|24-31|16-23| 8-15| 0- 7|
97 *
98 * For v2 directories that only contain entries with inode numbers that fit
99 * into 32bits a four-member array is used:
100 *
101 * |24-31|16-23| 8-15| 0- 7|
102 */
103
104#define XFS_GET_DIR_INO4(di) \
105 (((__u32)(di).i[0] << 24) | ((di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
106
107#define XFS_PUT_DIR_INO4(from, di) \
108do { \
109 (di).i[0] = (((from) & 0xff000000ULL) >> 24); \
110 (di).i[1] = (((from) & 0x00ff0000ULL) >> 16); \
111 (di).i[2] = (((from) & 0x0000ff00ULL) >> 8); \
112 (di).i[3] = ((from) & 0x000000ffULL); \
113} while (0)
114
115#define XFS_DI_HI(di) \
116 (((__u32)(di).i[1] << 16) | ((di).i[2] << 8) | ((di).i[3]))
117#define XFS_DI_LO(di) \
118 (((__u32)(di).i[4] << 24) | ((di).i[5] << 16) | ((di).i[6] << 8) | ((di).i[7]))
119
120#define XFS_GET_DIR_INO8(di) \
121 (((xfs_ino_t)XFS_DI_LO(di) & 0xffffffffULL) | \
122 ((xfs_ino_t)XFS_DI_HI(di) << 32))
123
124#define XFS_PUT_DIR_INO8(from, di) \
125do { \
126 (di).i[0] = 0; \
127 (di).i[1] = (((from) & 0x00ff000000000000ULL) >> 48); \
128 (di).i[2] = (((from) & 0x0000ff0000000000ULL) >> 40); \
129 (di).i[3] = (((from) & 0x000000ff00000000ULL) >> 32); \
130 (di).i[4] = (((from) & 0x00000000ff000000ULL) >> 24); \
131 (di).i[5] = (((from) & 0x0000000000ff0000ULL) >> 16); \
132 (di).i[6] = (((from) & 0x000000000000ff00ULL) >> 8); \
133 (di).i[7] = ((from) & 0x00000000000000ffULL); \
134} while (0)
135
136#endif /* __XFS_ARCH_H__ */