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a9c210ce JA |
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 | ||
a9c210ce JA |
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 | { | |
f2ccb5ae | 26 | struct io_epoll *epoll = io_kiocb_to_cmd(req, struct io_epoll); |
a9c210ce | 27 | |
61a2732a JA |
28 | pr_warn_once("%s: epoll_ctl support in io_uring is deprecated and will " |
29 | "be removed in a future Linux kernel version.\n", | |
30 | current->comm); | |
31 | ||
a9c210ce JA |
32 | if (sqe->buf_index || sqe->splice_fd_in) |
33 | return -EINVAL; | |
34 | ||
35 | epoll->epfd = READ_ONCE(sqe->fd); | |
36 | epoll->op = READ_ONCE(sqe->len); | |
37 | epoll->fd = READ_ONCE(sqe->off); | |
38 | ||
39 | if (ep_op_has_event(epoll->op)) { | |
40 | struct epoll_event __user *ev; | |
41 | ||
42 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
43 | if (copy_from_user(&epoll->event, ev, sizeof(*ev))) | |
44 | return -EFAULT; | |
45 | } | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) | |
51 | { | |
f2ccb5ae | 52 | struct io_epoll *ie = io_kiocb_to_cmd(req, struct io_epoll); |
a9c210ce JA |
53 | int ret; |
54 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
55 | ||
56 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
57 | if (force_nonblock && ret == -EAGAIN) | |
58 | return -EAGAIN; | |
59 | ||
60 | if (ret < 0) | |
61 | req_set_fail(req); | |
62 | io_req_set_res(req, ret, 0); | |
63 | return IOU_OK; | |
64 | } | |
65 | #endif |