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f2ccb5aed7
We need to make sure (at build time) that struct io_cmd_data is not casted to a structure that's larger. Signed-off-by: Stefan Metzmacher <metze@samba.org> Link: https://lore.kernel.org/r/c024cdf25ae19fc0319d4180e2298bade8ed17b8.1660201408.git.metze@samba.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/io_uring.h>
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#include <linux/eventpoll.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring.h"
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#include "epoll.h"
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#if defined(CONFIG_EPOLL)
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struct io_epoll {
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struct file *file;
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int epfd;
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int op;
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int fd;
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struct epoll_event event;
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};
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int io_epoll_ctl_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_epoll *epoll = io_kiocb_to_cmd(req, struct io_epoll);
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pr_warn_once("%s: epoll_ctl support in io_uring is deprecated and will "
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"be removed in a future Linux kernel version.\n",
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current->comm);
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if (sqe->buf_index || sqe->splice_fd_in)
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return -EINVAL;
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epoll->epfd = READ_ONCE(sqe->fd);
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epoll->op = READ_ONCE(sqe->len);
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epoll->fd = READ_ONCE(sqe->off);
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if (ep_op_has_event(epoll->op)) {
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struct epoll_event __user *ev;
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ev = u64_to_user_ptr(READ_ONCE(sqe->addr));
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if (copy_from_user(&epoll->event, ev, sizeof(*ev)))
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return -EFAULT;
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}
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return 0;
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}
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int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_epoll *ie = io_kiocb_to_cmd(req, struct io_epoll);
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int ret;
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bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
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ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock);
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if (force_nonblock && ret == -EAGAIN)
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return -EAGAIN;
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if (ret < 0)
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req_set_fail(req);
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io_req_set_res(req, ret, 0);
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return IOU_OK;
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}
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#endif
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