IOPRIO_CLASS_SHIFT   15 src/shared/ioprio.h #define IOPRIO_PRIO_MASK        ((1UL << IOPRIO_CLASS_SHIFT) - 1)
IOPRIO_CLASS_SHIFT   17 src/shared/ioprio.h #define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
IOPRIO_CLASS_SHIFT   19 src/shared/ioprio.h #define IOPRIO_PRIO_VALUE(class, data)  (((class) << IOPRIO_CLASS_SHIFT) | data)