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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/mm.h>
7#include <linux/slab.h>
8#include <linux/namei.h>
9#include <linux/io_uring.h>
10#include <linux/splice.h>
11
12#include <uapi/linux/io_uring.h>
13
14#include "io_uring.h"
15#include "splice.h"
16
17struct io_splice {
18 struct file *file_out;
19 loff_t off_out;
20 loff_t off_in;
21 u64 len;
22 int splice_fd_in;
23 unsigned int flags;
24};
25
26static int __io_splice_prep(struct io_kiocb *req,
27 const struct io_uring_sqe *sqe)
28{
29 struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
30 unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL;
31
32 sp->len = READ_ONCE(sqe->len);
33 sp->flags = READ_ONCE(sqe->splice_flags);
34 if (unlikely(sp->flags & ~valid_flags))
35 return -EINVAL;
36 sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in);
37 return 0;
38}
39
40int io_tee_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
41{
42 if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off))
43 return -EINVAL;
44 return __io_splice_prep(req, sqe);
45}
46
47int io_tee(struct io_kiocb *req, unsigned int issue_flags)
48{
49 struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
50 struct file *out = sp->file_out;
51 unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
52 struct file *in;
53 long ret = 0;
54
55 if (issue_flags & IO_URING_F_NONBLOCK)
56 return -EAGAIN;
57
58 if (sp->flags & SPLICE_F_FD_IN_FIXED)
59 in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
60 else
61 in = io_file_get_normal(req, sp->splice_fd_in);
62 if (!in) {
63 ret = -EBADF;
64 goto done;
65 }
66
67 if (sp->len)
68 ret = do_tee(in, out, sp->len, flags);
69
70 if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
71 io_put_file(in);
72done:
73 if (ret != sp->len)
74 req_set_fail(req);
75 io_req_set_res(req, ret, 0);
76 return IOU_OK;
77}
78
79int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
80{
81 struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
82
83 sp->off_in = READ_ONCE(sqe->splice_off_in);
84 sp->off_out = READ_ONCE(sqe->off);
85 return __io_splice_prep(req, sqe);
86}
87
88int io_splice(struct io_kiocb *req, unsigned int issue_flags)
89{
90 struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
91 struct file *out = sp->file_out;
92 unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
93 loff_t *poff_in, *poff_out;
94 struct file *in;
95 long ret = 0;
96
97 if (issue_flags & IO_URING_F_NONBLOCK)
98 return -EAGAIN;
99
100 if (sp->flags & SPLICE_F_FD_IN_FIXED)
101 in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags);
102 else
103 in = io_file_get_normal(req, sp->splice_fd_in);
104 if (!in) {
105 ret = -EBADF;
106 goto done;
107 }
108
109 poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
110 poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;
111
112 if (sp->len)
113 ret = do_splice(in, poff_in, out, poff_out, sp->len, flags);
114
115 if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
116 io_put_file(in);
117done:
118 if (ret != sp->len)
119 req_set_fail(req);
120 io_req_set_res(req, ret, 0);
121 return IOU_OK;
122}