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/io_uring.h> 7 8#include <uapi/linux/io_uring.h> 9 10#include "io_uring.h" 11#include "nop.h" 12 13struct io_nop { 14 /* NOTE: kiocb has the file as the first member, so don't do it here */ 15 struct file *file; 16 int result; 17}; 18 19int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 20{ 21 unsigned int flags; 22 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop); 23 24 flags = READ_ONCE(sqe->nop_flags); 25 if (flags & ~IORING_NOP_INJECT_RESULT) 26 return -EINVAL; 27 28 if (flags & IORING_NOP_INJECT_RESULT) 29 nop->result = READ_ONCE(sqe->len); 30 else 31 nop->result = 0; 32 return 0; 33} 34 35int io_nop(struct io_kiocb *req, unsigned int issue_flags) 36{ 37 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop); 38 39 if (nop->result < 0) 40 req_set_fail(req); 41 io_req_set_res(req, nop->result, 0); 42 return IOU_OK; 43} 44