44 lines
860 B
C
44 lines
860 B
C
#ifndef FIO_ERR_H
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#define FIO_ERR_H
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/*
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* Kernel pointers have redundant information, so we can use a
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* scheme where we can return either an error code or a dentry
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* pointer with the same return value.
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*
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* This should be a per-architecture thing, to allow different
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* error and pointer decisions.
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*/
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#define MAX_ERRNO 4095
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#define IS_ERR_VALUE(x) ((x) >= (uintptr_t)-MAX_ERRNO)
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static inline void *ERR_PTR(uintptr_t error)
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{
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return (void *) error;
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}
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static inline uintptr_t PTR_ERR(const void *ptr)
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{
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return (uintptr_t) ptr;
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}
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static inline uintptr_t IS_ERR(const void *ptr)
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{
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return IS_ERR_VALUE((uintptr_t)ptr);
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}
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static inline uintptr_t IS_ERR_OR_NULL(const void *ptr)
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{
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return !ptr || IS_ERR_VALUE((uintptr_t)ptr);
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}
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static inline int PTR_ERR_OR_ZERO(const void *ptr)
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{
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if (IS_ERR(ptr))
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return PTR_ERR(ptr);
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else
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return 0;
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}
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#endif
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