mainline inclusion
from mainline-5.6-rc1
commit 3e4827b0
category: feature
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=27
CVE: NA
---------------------------

This adds IORING_OP_EPOLL_CTL, which can perform the same work as the
epoll_ctl(2) system call.
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Conflicts:
	fs/io_uring.c
	include/uapi/linux/io_uring.h
[commit cebdb986("io_uring: add support for IORING_OP_OPENAT2")
 is not applied]
Signed-off-by: Nyangerkun <yangerkun@huawei.com>
Reviewed-by: Nzhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>