1a9c210ceSJens Axboe // SPDX-License-Identifier: GPL-2.0
2a9c210ceSJens Axboe #include <linux/kernel.h>
3a9c210ceSJens Axboe #include <linux/errno.h>
4a9c210ceSJens Axboe #include <linux/file.h>
5a9c210ceSJens Axboe #include <linux/fs.h>
6a9c210ceSJens Axboe #include <linux/uaccess.h>
7a9c210ceSJens Axboe #include <linux/io_uring.h>
8a9c210ceSJens Axboe #include <linux/eventpoll.h>
9a9c210ceSJens Axboe
10a9c210ceSJens Axboe #include <uapi/linux/io_uring.h>
11a9c210ceSJens Axboe
12a9c210ceSJens Axboe #include "io_uring.h"
13a9c210ceSJens Axboe #include "epoll.h"
14a9c210ceSJens Axboe
15a9c210ceSJens Axboe #if defined(CONFIG_EPOLL)
16a9c210ceSJens Axboe struct io_epoll {
17a9c210ceSJens Axboe struct file *file;
18a9c210ceSJens Axboe int epfd;
19a9c210ceSJens Axboe int op;
20a9c210ceSJens Axboe int fd;
21a9c210ceSJens Axboe struct epoll_event event;
22a9c210ceSJens Axboe };
23a9c210ceSJens Axboe
io_epoll_ctl_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)24a9c210ceSJens Axboe int io_epoll_ctl_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
25a9c210ceSJens Axboe {
26*f2ccb5aeSStefan Metzmacher struct io_epoll *epoll = io_kiocb_to_cmd(req, struct io_epoll);
27a9c210ceSJens Axboe
28a9c210ceSJens Axboe if (sqe->buf_index || sqe->splice_fd_in)
29a9c210ceSJens Axboe return -EINVAL;
30a9c210ceSJens Axboe
31a9c210ceSJens Axboe epoll->epfd = READ_ONCE(sqe->fd);
32a9c210ceSJens Axboe epoll->op = READ_ONCE(sqe->len);
33a9c210ceSJens Axboe epoll->fd = READ_ONCE(sqe->off);
34a9c210ceSJens Axboe
35a9c210ceSJens Axboe if (ep_op_has_event(epoll->op)) {
36a9c210ceSJens Axboe struct epoll_event __user *ev;
37a9c210ceSJens Axboe
38a9c210ceSJens Axboe ev = u64_to_user_ptr(READ_ONCE(sqe->addr));
39a9c210ceSJens Axboe if (copy_from_user(&epoll->event, ev, sizeof(*ev)))
40a9c210ceSJens Axboe return -EFAULT;
41a9c210ceSJens Axboe }
42a9c210ceSJens Axboe
43a9c210ceSJens Axboe return 0;
44a9c210ceSJens Axboe }
45a9c210ceSJens Axboe
io_epoll_ctl(struct io_kiocb * req,unsigned int issue_flags)46a9c210ceSJens Axboe int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)
47a9c210ceSJens Axboe {
48*f2ccb5aeSStefan Metzmacher struct io_epoll *ie = io_kiocb_to_cmd(req, struct io_epoll);
49a9c210ceSJens Axboe int ret;
50a9c210ceSJens Axboe bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
51a9c210ceSJens Axboe
52a9c210ceSJens Axboe ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock);
53a9c210ceSJens Axboe if (force_nonblock && ret == -EAGAIN)
54a9c210ceSJens Axboe return -EAGAIN;
55a9c210ceSJens Axboe
56a9c210ceSJens Axboe if (ret < 0)
57a9c210ceSJens Axboe req_set_fail(req);
58a9c210ceSJens Axboe io_req_set_res(req, ret, 0);
59a9c210ceSJens Axboe return IOU_OK;
60a9c210ceSJens Axboe }
61a9c210ceSJens Axboe #endif
62