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44 lines
860 B
44 lines
860 B
#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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