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 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 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 { 52 struct io_epoll *ie = io_kiocb_to_cmd(req, struct io_epoll); 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 66