LINUX_KQ_FLAG_NEED_READ
filp->f_kqflags |= LINUX_KQ_FLAG_NEED_READ |
return ((filp->f_kqflags & LINUX_KQ_FLAG_NEED_READ) ? 1 : 0);
filp->f_kqflags &= ~(LINUX_KQ_FLAG_NEED_READ |
filp->f_kqflags |= LINUX_KQ_FLAG_NEED_READ;