mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
4ea0bf4b98
Libuv recently started using it so there is at least one consumer now.
Cc: stable@vger.kernel.org
Fixes: 61a2732af4 ("io_uring: deprecate epoll_ctl support")
Link: https://github.com/libuv/libuv/pull/3979
Signed-off-by: Ben Noordhuis <info@bnoordhuis.nl>
Link: https://lore.kernel.org/r/20230506095502.13401-1-info@bnoordhuis.nl
Signed-off-by: Jens Axboe <axboe@kernel.dk>
61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
// 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);
|
|
|
|
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
|