1#ifndef FIO_ERR_H 2#define FIO_ERR_H 3 4/* 5 * Kernel pointers have redundant information, so we can use a 6 * scheme where we can return either an error code or a dentry 7 * pointer with the same return value. 8 * 9 * This should be a per-architecture thing, to allow different 10 * error and pointer decisions. 11 */ 12#define MAX_ERRNO 4095 13 14#define IS_ERR_VALUE(x) ((x) >= (uintptr_t)-MAX_ERRNO) 15 16static inline void *ERR_PTR(uintptr_t error) 17{ 18 return (void *) error; 19} 20 21static inline uintptr_t PTR_ERR(const void *ptr) 22{ 23 return (uintptr_t) ptr; 24} 25 26static inline uintptr_t IS_ERR(const void *ptr) 27{ 28 return IS_ERR_VALUE((uintptr_t)ptr); 29} 30 31static inline uintptr_t IS_ERR_OR_NULL(const void *ptr) 32{ 33 return !ptr || IS_ERR_VALUE((uintptr_t)ptr); 34} 35 36static inline int PTR_ERR_OR_ZERO(const void *ptr) 37{ 38 if (IS_ERR(ptr)) 39 return PTR_ERR(ptr); 40 else 41 return 0; 42} 43 44#endif 45