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 ERR_PTR(uintptr_t error)16 static inline void *ERR_PTR(uintptr_t error) 17 { 18 return (void *) error; 19 } 20 PTR_ERR(const void * ptr)21 static inline uintptr_t PTR_ERR(const void *ptr) 22 { 23 return (uintptr_t) ptr; 24 } 25 IS_ERR(const void * ptr)26 static inline uintptr_t IS_ERR(const void *ptr) 27 { 28 return IS_ERR_VALUE((uintptr_t)ptr); 29 } 30 IS_ERR_OR_NULL(const void * ptr)31 static inline uintptr_t IS_ERR_OR_NULL(const void *ptr) 32 { 33 return !ptr || IS_ERR_VALUE((uintptr_t)ptr); 34 } 35 PTR_ERR_OR_ZERO(const void * ptr)36 static 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