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 13 struct 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 io_nop_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)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 io_nop(struct io_kiocb * req,unsigned int issue_flags)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