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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/kdev_t.h | |
download | kernel_samsung_espresso10-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_espresso10-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_espresso10-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-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 'include/linux/kdev_t.h')
-rw-r--r-- | include/linux/kdev_t.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/include/linux/kdev_t.h b/include/linux/kdev_t.h new file mode 100644 index 0000000..bceea52 --- /dev/null +++ b/include/linux/kdev_t.h @@ -0,0 +1,101 @@ +#ifndef _LINUX_KDEV_T_H +#define _LINUX_KDEV_T_H +#ifdef __KERNEL__ +#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\n", 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; +} + + +#else /* __KERNEL__ */ + +/* +Some programs want their definitions of MAJOR and MINOR and MKDEV +from the kernel sources. These must be the externally visible ones. +*/ +#define MAJOR(dev) ((dev)>>8) +#define MINOR(dev) ((dev) & 0xff) +#define MKDEV(ma,mi) ((ma)<<8 | (mi)) +#endif /* __KERNEL__ */ +#endif |