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83 lines
1.8 KiB
83 lines
1.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_KDEV_T_H |
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#define _LINUX_KDEV_T_H |
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#include <uapi/linux/kdev_t.h> |
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#define MINORBITS 20 |
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#define MINORMASK ((1U << MINORBITS) - 1) |
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#define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS)) |
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#define MINOR(dev) ((unsigned int) ((dev) & MINORMASK)) |
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#define MKDEV(ma,mi) (((ma) << MINORBITS) | (mi)) |
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#define print_dev_t(buffer, dev) \ |
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sprintf((buffer), "%u:%u\n", MAJOR(dev), MINOR(dev)) |
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#define format_dev_t(buffer, dev) \ |
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({ \ |
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sprintf(buffer, "%u:%u", MAJOR(dev), MINOR(dev)); \ |
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buffer; \ |
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}) |
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/* acceptable for old filesystems */ |
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static __always_inline bool old_valid_dev(dev_t dev) |
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{ |
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return MAJOR(dev) < 256 && MINOR(dev) < 256; |
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} |
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static __always_inline u16 old_encode_dev(dev_t dev) |
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{ |
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return (MAJOR(dev) << 8) | MINOR(dev); |
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} |
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static __always_inline dev_t old_decode_dev(u16 val) |
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{ |
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return MKDEV((val >> 8) & 255, val & 255); |
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} |
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static __always_inline u32 new_encode_dev(dev_t dev) |
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{ |
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unsigned major = MAJOR(dev); |
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unsigned minor = MINOR(dev); |
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return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12); |
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} |
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static __always_inline dev_t new_decode_dev(u32 dev) |
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{ |
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unsigned major = (dev & 0xfff00) >> 8; |
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unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); |
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return MKDEV(major, minor); |
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} |
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static __always_inline u64 huge_encode_dev(dev_t dev) |
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{ |
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return new_encode_dev(dev); |
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} |
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static __always_inline dev_t huge_decode_dev(u64 dev) |
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{ |
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return new_decode_dev(dev); |
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} |
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static __always_inline int sysv_valid_dev(dev_t dev) |
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{ |
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return MAJOR(dev) < (1<<14) && MINOR(dev) < (1<<18); |
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} |
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static __always_inline u32 sysv_encode_dev(dev_t dev) |
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{ |
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return MINOR(dev) | (MAJOR(dev) << 18); |
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} |
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static __always_inline unsigned sysv_major(u32 dev) |
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{ |
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return (dev >> 18) & 0x3fff; |
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} |
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static __always_inline unsigned sysv_minor(u32 dev) |
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{ |
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return dev & 0x3ffff; |
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} |
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#endif
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