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authorJens Axboe <axboe@kernel.dk>2022-05-25 06:09:18 -0600
committerJens Axboe <axboe@kernel.dk>2022-07-24 18:39:11 -0600
commita9c210cebe13c36487a239ae7f4671a389fed127 (patch)
tree3aef4833aa165b8cee9e2251043d259466309da5 /io_uring/epoll.c
parent4cf90495281b43f5f597ef4a9abcc83a63973571 (diff)
io_uring: move epoll handler to its own file
Would be nice to sort out Kconfig for this and don't even compile epoll.c if we don't have epoll configured. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/epoll.c')
-rw-r--r--io_uring/epoll.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/io_uring/epoll.c b/io_uring/epoll.c
new file mode 100644
index 000000000000..acbb32498127
--- /dev/null
+++ b/io_uring/epoll.c
@@ -0,0 +1,62 @@
+// 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_types.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);
+
+ 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);
+ 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