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 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 { 29 struct io_splice *sp = io_kiocb_to_cmd(req); 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 { 49 struct io_splice *sp = io_kiocb_to_cmd(req); 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 { 81 struct io_splice *sp = io_kiocb_to_cmd(req); 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 { 90 struct io_splice *sp = io_kiocb_to_cmd(req); 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 } 123