| #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 |