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1// SPDX-License-Identifier: GPL-2.02#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 req->flags |= REQ_F_FORCE_ASYNC;38 return 0;39}40 41int 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 48int 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 else61 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);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 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 else102 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);116done:117 if (ret != sp->len)118 req_set_fail(req);119 io_req_set_res(req, ret, 0);120 return IOU_OK;121}122