LINUX_KQ_FLAG_HAS_WRITE
filp->f_kqflags |= LINUX_KQ_FLAG_HAS_WRITE;
LINUX_KQ_FLAG_HAS_READ | LINUX_KQ_FLAG_HAS_WRITE);
linux_file_kqfilter_poll(filp, LINUX_KQ_FLAG_HAS_WRITE);
LINUX_KQ_FLAG_HAS_READ | LINUX_KQ_FLAG_HAS_WRITE);