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1 | #ifndef _LINUX_KDEV_T_H |
2 | #define _LINUX_KDEV_T_H |
3 | #ifdef __KERNEL__ |
4 | #define MINORBITS 20 |
5 | #define MINORMASK ((1U << MINORBITS) - 1) |
6 | |
7 | #define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS)) |
8 | #define MINOR(dev) ((unsigned int) ((dev) & MINORMASK)) |
9 | #define MKDEV(ma,mi) (((ma) << MINORBITS) | (mi)) |
10 | |
11 | #define print_dev_t(buffer, dev) \ |
12 | sprintf((buffer), "%u:%u\n", MAJOR(dev), MINOR(dev)) |
13 | |
14 | #define format_dev_t(buffer, dev) \ |
15 | ({ \ |
16 | sprintf(buffer, "%u:%u", MAJOR(dev), MINOR(dev)); \ |
17 | buffer; \ |
18 | }) |
19 | |
20 | /* acceptable for old filesystems */ |
21 | static inline int old_valid_dev(dev_t dev) |
22 | { |
23 | return MAJOR(dev) < 256 && MINOR(dev) < 256; |
24 | } |
25 | |
26 | static inline u16 old_encode_dev(dev_t dev) |
27 | { |
28 | return (MAJOR(dev) << 8) | MINOR(dev); |
29 | } |
30 | |
31 | static inline dev_t old_decode_dev(u16 val) |
32 | { |
33 | return MKDEV((val >> 8) & 255, val & 255); |
34 | } |
35 | |
36 | static inline int new_valid_dev(dev_t dev) |
37 | { |
38 | return 1; |
39 | } |
40 | |
41 | static inline u32 new_encode_dev(dev_t dev) |
42 | { |
43 | unsigned major = MAJOR(dev); |
44 | unsigned minor = MINOR(dev); |
45 | return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12); |
46 | } |
47 | |
48 | static inline dev_t new_decode_dev(u32 dev) |
49 | { |
50 | unsigned major = (dev & 0xfff00) >> 8; |
51 | unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); |
52 | return MKDEV(major, minor); |
53 | } |
54 | |
55 | static inline int huge_valid_dev(dev_t dev) |
56 | { |
57 | return 1; |
58 | } |
59 | |
60 | static inline u64 huge_encode_dev(dev_t dev) |
61 | { |
62 | return new_encode_dev(dev); |
63 | } |
64 | |
65 | static inline dev_t huge_decode_dev(u64 dev) |
66 | { |
67 | return new_decode_dev(dev); |
68 | } |
69 | |
70 | static inline int sysv_valid_dev(dev_t dev) |
71 | { |
72 | return MAJOR(dev) < (1<<14) && MINOR(dev) < (1<<18); |
73 | } |
74 | |
75 | static inline u32 sysv_encode_dev(dev_t dev) |
76 | { |
77 | return MINOR(dev) | (MAJOR(dev) << 18); |
78 | } |
79 | |
80 | static inline unsigned sysv_major(u32 dev) |
81 | { |
82 | return (dev >> 18) & 0x3fff; |
83 | } |
84 | |
85 | static inline unsigned sysv_minor(u32 dev) |
86 | { |
87 | return dev & 0x3ffff; |
88 | } |
89 | |
90 | #else /* __KERNEL__ */ |
91 | |
92 | /* |
93 | Some programs want their definitions of MAJOR and MINOR and MKDEV |
94 | from the kernel sources. These must be the externally visible ones. |
95 | */ |
96 | #define MAJOR(dev) ((dev)>>8) |
97 | #define MINOR(dev) ((dev) & 0xff) |
98 | #define MKDEV(ma,mi) ((ma)<<8 | (mi)) |
99 | #endif /* __KERNEL__ */ |
100 | #endif |
101 |
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