Blame view
include/linux/kdev_t.h
1.78 KB
1da177e4c
|
1 2 |
#ifndef _LINUX_KDEV_T_H #define _LINUX_KDEV_T_H |
607ca46e9
|
3 4 |
#include <uapi/linux/kdev_t.h> |
1da177e4c
|
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 |
#define MINORBITS 20 #define MINORMASK ((1U << MINORBITS) - 1) #define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS)) #define MINOR(dev) ((unsigned int) ((dev) & MINORMASK)) #define MKDEV(ma,mi) (((ma) << MINORBITS) | (mi)) #define print_dev_t(buffer, dev) \ sprintf((buffer), "%u:%u ", MAJOR(dev), MINOR(dev)) #define format_dev_t(buffer, dev) \ ({ \ sprintf(buffer, "%u:%u", MAJOR(dev), MINOR(dev)); \ buffer; \ }) /* acceptable for old filesystems */ static inline int old_valid_dev(dev_t dev) { return MAJOR(dev) < 256 && MINOR(dev) < 256; } static inline u16 old_encode_dev(dev_t dev) { return (MAJOR(dev) << 8) | MINOR(dev); } static inline dev_t old_decode_dev(u16 val) { return MKDEV((val >> 8) & 255, val & 255); } static inline int new_valid_dev(dev_t dev) { return 1; } static inline u32 new_encode_dev(dev_t dev) { unsigned major = MAJOR(dev); unsigned minor = MINOR(dev); return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12); } static inline dev_t new_decode_dev(u32 dev) { unsigned major = (dev & 0xfff00) >> 8; unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); return MKDEV(major, minor); } static inline int huge_valid_dev(dev_t dev) { return 1; } static inline u64 huge_encode_dev(dev_t dev) { return new_encode_dev(dev); } static inline dev_t huge_decode_dev(u64 dev) { return new_decode_dev(dev); } static inline int sysv_valid_dev(dev_t dev) { return MAJOR(dev) < (1<<14) && MINOR(dev) < (1<<18); } static inline u32 sysv_encode_dev(dev_t dev) { return MINOR(dev) | (MAJOR(dev) << 18); } static inline unsigned sysv_major(u32 dev) { return (dev >> 18) & 0x3fff; } static inline unsigned sysv_minor(u32 dev) { return dev & 0x3ffff; } |
1da177e4c
|
91 |
#endif |