Jens Axboe | 531113b | 2022-05-24 21:19:47 -0600 | [diff] [blame] | 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 | |
Jens Axboe | 531113b | 2022-05-24 21:19:47 -0600 | [diff] [blame] | 14 | #include "io_uring.h" |
| 15 | #include "splice.h" |
| 16 | |
| 17 | struct 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 | |
| 26 | static int __io_splice_prep(struct io_kiocb *req, |
| 27 | const struct io_uring_sqe *sqe) |
| 28 | { |
Stefan Metzmacher | f2ccb5a | 2022-08-11 09:11:15 +0200 | [diff] [blame] | 29 | struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice); |
Jens Axboe | 531113b | 2022-05-24 21:19:47 -0600 | [diff] [blame] | 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 | |
| 40 | int 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 | |
| 47 | int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
| 48 | { |
Stefan Metzmacher | f2ccb5a | 2022-08-11 09:11:15 +0200 | [diff] [blame] | 49 | struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice); |
Jens Axboe | 531113b | 2022-05-24 21:19:47 -0600 | [diff] [blame] | 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); |
| 72 | done: |
| 73 | if (ret != sp->len) |
| 74 | req_set_fail(req); |
| 75 | io_req_set_res(req, ret, 0); |
| 76 | return IOU_OK; |
| 77 | } |
| 78 | |
| 79 | int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 80 | { |
Stefan Metzmacher | f2ccb5a | 2022-08-11 09:11:15 +0200 | [diff] [blame] | 81 | struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice); |
Jens Axboe | 531113b | 2022-05-24 21:19:47 -0600 | [diff] [blame] | 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 | |
| 88 | int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
| 89 | { |
Stefan Metzmacher | f2ccb5a | 2022-08-11 09:11:15 +0200 | [diff] [blame] | 90 | struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice); |
Jens Axboe | 531113b | 2022-05-24 21:19:47 -0600 | [diff] [blame] | 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); |
| 117 | done: |
| 118 | if (ret != sp->len) |
| 119 | req_set_fail(req); |
| 120 | io_req_set_res(req, ret, 0); |
| 121 | return IOU_OK; |
| 122 | } |