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1// SPDX-License-Identifier: GPL-2.02#include <linux/kernel.h>3#include <linux/errno.h>4#include <linux/file.h>5#include <linux/fs.h>6#include <linux/uaccess.h>7#include <linux/io_uring.h>8#include <linux/eventpoll.h>9 10#include <uapi/linux/io_uring.h>11 12#include "io_uring.h"13#include "epoll.h"14 15#if defined(CONFIG_EPOLL)16struct io_epoll {17 struct file *file;18 int epfd;19 int op;20 int fd;21 struct epoll_event event;22};23 24int io_epoll_ctl_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)25{26 struct io_epoll *epoll = io_kiocb_to_cmd(req, struct io_epoll);27 28 if (sqe->buf_index || sqe->splice_fd_in)29 return -EINVAL;30 31 epoll->epfd = READ_ONCE(sqe->fd);32 epoll->op = READ_ONCE(sqe->len);33 epoll->fd = READ_ONCE(sqe->off);34 35 if (ep_op_has_event(epoll->op)) {36 struct epoll_event __user *ev;37 38 ev = u64_to_user_ptr(READ_ONCE(sqe->addr));39 if (copy_from_user(&epoll->event, ev, sizeof(*ev)))40 return -EFAULT;41 }42 43 return 0;44}45 46int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)47{48 struct io_epoll *ie = io_kiocb_to_cmd(req, struct io_epoll);49 int ret;50 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;51 52 ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock);53 if (force_nonblock && ret == -EAGAIN)54 return -EAGAIN;55 56 if (ret < 0)57 req_set_fail(req);58 io_req_set_res(req, ret, 0);59 return IOU_OK;60}61#endif62