// SPDX-License-Identifier: GPL-2.0 #include <linux/kernel.h> #include <linux/errno.h> #include <linux/file.h> #include <linux/fs.h> #include <linux/uaccess.h> #include <linux/io_uring.h> #include <linux/eventpoll.h> #include <uapi/linux/io_uring.h> #include "io_uring.h" #include "epoll.h" #if defined(CONFIG_EPOLL) struct io_epoll { struct file *file; int epfd; int op; int fd; struct epoll_event event; }; int io_epoll_ctl_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { struct io_epoll *epoll = io_kiocb_to_cmd(req, struct io_epoll); pr_warn_once("%s: epoll_ctl support in io_uring is deprecated and will " "be removed in a future Linux kernel version.\n", current->comm); if (sqe->buf_index || sqe->splice_fd_in) return -EINVAL; epoll->epfd = READ_ONCE(sqe->fd); epoll->op = READ_ONCE(sqe->len); epoll->fd = READ_ONCE(sqe->off); if (ep_op_has_event(epoll->op)) { struct epoll_event __user *ev; ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); if (copy_from_user(&epoll->event, ev, sizeof(*ev))) return -EFAULT; } return 0; } int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) { struct io_epoll *ie = io_kiocb_to_cmd(req, struct io_epoll); int ret; bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); if (force_nonblock && ret == -EAGAIN) return -EAGAIN; if (ret < 0) req_set_fail(req); io_req_set_res(req, ret, 0); return IOU_OK; } #endif