Commit 3d200242 authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring: add buffer selection support to IORING_OP_NOP 



Obviously not really useful since it's not transferring data, but it
is helpful in benchmarking overhead of provided buffers.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent e7637a49

fs/io_uring.c

+12 −1
Original line number Diff line number Diff line
@@ -1058,6 +1058,7 @@ static const struct io_op_def io_op_defs[] = { 
	[IORING_OP_NOP] = {

		.audit_skip		= 1,

		.iopoll			= 1,

		.buffer_select		= 1,

	},

	[IORING_OP_READV] = {

		.needs_file		= 1,
@@ -4538,7 +4539,17 @@ static int io_splice(struct io_kiocb *req, unsigned int issue_flags) 
 */

static int io_nop(struct io_kiocb *req, unsigned int issue_flags)

{

	__io_req_complete(req, issue_flags, 0, 0);

	void __user *buf;



	if (req->flags & REQ_F_BUFFER_SELECT) {

		size_t len = 1;



		buf = io_buffer_select(req, &len, issue_flags);

		if (IS_ERR(buf))

			return PTR_ERR(buf);

	}



	__io_req_complete(req, issue_flags, 0, io_put_kbuf(req, issue_flags));

	return 0;

}