1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #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) |
16 | struct io_epoll { |
17 | struct file *file; |
18 | int epfd; |
19 | int op; |
20 | int fd; |
21 | struct epoll_event event; |
22 | }; |
23 | |
24 | int 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(op: epoll->op)) { |
36 | struct epoll_event __user *ev; |
37 | |
38 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
39 | if (copy_from_user(to: &epoll->event, from: ev, n: sizeof(*ev))) |
40 | return -EFAULT; |
41 | } |
42 | |
43 | return 0; |
44 | } |
45 | |
46 | int 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(epfd: ie->epfd, op: ie->op, fd: ie->fd, epds: &ie->event, nonblock: 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, res: ret, cflags: 0); |
59 | return IOU_OK; |
60 | } |
61 | #endif |
62 | |