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