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// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/io_uring.h>
#include <uapi/linux/io_uring.h>
#include "io_uring_types.h"
#include "io_uring.h"
#include "msg_ring.h"
struct io_msg {
struct file *file;
u64 user_data;
u32 len;
};
int io_msg_ring_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_msg *msg = io_kiocb_to_cmd(req);
if (unlikely(sqe->addr || sqe->rw_flags || sqe->splice_fd_in ||
sqe->buf_index || sqe->personality))
return -EINVAL;
msg->user_data = READ_ONCE(sqe->off);
msg->len = READ_ONCE(sqe->len);
return 0;
}
int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_msg *msg = io_kiocb_to_cmd(req);
struct io_ring_ctx *target_ctx;
bool filled;
int ret;
ret = -EBADFD;
if (!io_is_uring_fops(req->file))
goto done;
ret = -EOVERFLOW;
target_ctx = req->file->private_data;
spin_lock(&target_ctx->completion_lock);
filled = io_fill_cqe_aux(target_ctx, msg->user_data, msg->len, 0);
io_commit_cqring(target_ctx);
spin_unlock(&target_ctx->completion_lock);
if (filled) {
io_cqring_ev_posted(target_ctx);
ret = 0;
}
done:
if (ret < 0)
req_set_fail(req);
io_req_set_res(req, ret, 0);
/* put file to avoid an attempt to IOPOLL the req */
io_put_file(req->file);
req->file = NULL;
return IOU_OK;
}
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