FPB_RESPECT_SOFT_DIRTY
if (likely(!(flags & FPB_RESPECT_SOFT_DIRTY)))
flags |= FPB_RESPECT_SOFT_DIRTY;
const fpb_t flags = FPB_RESPECT_SOFT_DIRTY | FPB_RESPECT_WRITE;
FPB_RESPECT_WRITE | FPB_RESPECT_SOFT_DIRTY);