IOPRIO_CLASS_SHIFT   13 include/linux/ioprio.h #define IOPRIO_PRIO_MASK	((1UL << IOPRIO_CLASS_SHIFT) - 1)
IOPRIO_CLASS_SHIFT   15 include/linux/ioprio.h #define IOPRIO_PRIO_CLASS(mask)	((mask) >> IOPRIO_CLASS_SHIFT)
IOPRIO_CLASS_SHIFT   17 include/linux/ioprio.h #define IOPRIO_PRIO_VALUE(class, data)	(((class) << IOPRIO_CLASS_SHIFT) | data)