tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kernel.h>
3#include <linux/errno.h>
4#include <linux/fs.h>
5#include <linux/file.h>
6#include <linux/io_uring.h>
7
8#include <uapi/linux/io_uring.h>
9
10#include "io_uring.h"
11#include "rsrc.h"
12#include "nop.h"
13
14struct io_nop {
15 /* NOTE: kiocb has the file as the first member, so don't do it here */
16 struct file *file;
17 int result;
18 int fd;
19 unsigned int flags;
20};
21
22#define NOP_FLAGS (IORING_NOP_INJECT_RESULT | IORING_NOP_FIXED_FILE | \
23 IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE | \
24 IORING_NOP_TW)
25
26int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
27{
28 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
29
30 nop->flags = READ_ONCE(sqe->nop_flags);
31 if (nop->flags & ~NOP_FLAGS)
32 return -EINVAL;
33
34 if (nop->flags & IORING_NOP_INJECT_RESULT)
35 nop->result = READ_ONCE(sqe->len);
36 else
37 nop->result = 0;
38 if (nop->flags & IORING_NOP_FILE)
39 nop->fd = READ_ONCE(sqe->fd);
40 else
41 nop->fd = -1;
42 if (nop->flags & IORING_NOP_FIXED_BUFFER)
43 req->buf_index = READ_ONCE(sqe->buf_index);
44 return 0;
45}
46
47int io_nop(struct io_kiocb *req, unsigned int issue_flags)
48{
49 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
50 int ret = nop->result;
51
52 if (nop->flags & IORING_NOP_FILE) {
53 if (nop->flags & IORING_NOP_FIXED_FILE) {
54 req->file = io_file_get_fixed(req, nop->fd, issue_flags);
55 req->flags |= REQ_F_FIXED_FILE;
56 } else {
57 req->file = io_file_get_normal(req, nop->fd);
58 }
59 if (!req->file) {
60 ret = -EBADF;
61 goto done;
62 }
63 }
64 if (nop->flags & IORING_NOP_FIXED_BUFFER) {
65 if (!io_find_buf_node(req, issue_flags))
66 ret = -EFAULT;
67 }
68done:
69 if (ret < 0)
70 req_set_fail(req);
71 io_req_set_res(req, nop->result, 0);
72 if (nop->flags & IORING_NOP_TW) {
73 req->io_task_work.func = io_req_task_complete;
74 io_req_task_work_add(req);
75 return IOU_ISSUE_SKIP_COMPLETE;
76 }
77 return IOU_COMPLETE;
78}