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