Line data    Source code

       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           0 : int io_epoll_ctl_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
      25             : {
      26           0 :         struct io_epoll *epoll = io_kiocb_to_cmd(req, struct io_epoll);
      27             : 
      28           0 :         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           0 :         if (sqe->buf_index || sqe->splice_fd_in)
      33             :                 return -EINVAL;
      34             : 
      35           0 :         epoll->epfd = READ_ONCE(sqe->fd);
      36           0 :         epoll->op = READ_ONCE(sqe->len);
      37           0 :         epoll->fd = READ_ONCE(sqe->off);
      38             : 
      39           0 :         if (ep_op_has_event(epoll->op)) {
      40             :                 struct epoll_event __user *ev;
      41             : 
      42           0 :                 ev = u64_to_user_ptr(READ_ONCE(sqe->addr));
      43           0 :                 if (copy_from_user(&epoll->event, ev, sizeof(*ev)))
      44             :                         return -EFAULT;
      45             :         }
      46             : 
      47             :         return 0;
      48             : }
      49             : 
      50           0 : int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)
      51             : {
      52           0 :         struct io_epoll *ie = io_kiocb_to_cmd(req, struct io_epoll);
      53             :         int ret;
      54           0 :         bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
      55             : 
      56           0 :         ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock);
      57           0 :         if (force_nonblock && ret == -EAGAIN)
      58             :                 return -EAGAIN;
      59             : 
      60           0 :         if (ret < 0)
      61           0 :                 req_set_fail(req);
      62           0 :         io_req_set_res(req, ret, 0);
      63           0 :         return IOU_OK;
      64             : }
      65             : #endif