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
14 struct 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
io_nop_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)26 int 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
io_nop(struct io_kiocb * req,unsigned int issue_flags)47 int 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 }
68 done:
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 }
79