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, 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 req->flags |= REQ_F_FORCE_ASYNC; 38 return 0; 39 } 40 41 int io_tee_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 42 { 43 if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) 44 return -EINVAL; 45 return __io_splice_prep(req, sqe); 46 } 47 48 int io_tee(struct io_kiocb *req, unsigned int issue_flags) 49 { 50 struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice); 51 struct file *out = sp->file_out; 52 unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; 53 struct file *in; 54 ssize_t ret = 0; 55 56 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 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 fput(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, 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 88 int 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 ssize_t ret = 0; 96 97 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 98 99 if (sp->flags & SPLICE_F_FD_IN_FIXED) 100 in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); 101 else 102 in = io_file_get_normal(req, sp->splice_fd_in); 103 if (!in) { 104 ret = -EBADF; 105 goto done; 106 } 107 108 poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; 109 poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; 110 111 if (sp->len) 112 ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); 113 114 if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) 115 fput(in); 116 done: 117 if (ret != sp->len) 118 req_set_fail(req); 119 io_req_set_res(req, ret, 0); 120 return IOU_OK; 121 } 122