[linux-block.git] / io_uring / nop.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/io_uring.h>

#include <uapi/linux/io_uring.h>

#include "io_uring.h"
#include "nop.h"

struct io_nop {
	/* NOTE: kiocb has the file as the first member, so don't do it here */
	struct file     *file;
	int             result;
};

int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	unsigned int flags;
	struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);

	flags = READ_ONCE(sqe->nop_flags);
	if (flags & ~IORING_NOP_INJECT_RESULT)
		return -EINVAL;

	if (flags & IORING_NOP_INJECT_RESULT)
		nop->result = READ_ONCE(sqe->len);
	else
		nop->result = 0;
	return 0;
}

int io_nop(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);

	if (nop->result < 0)
		req_set_fail(req);
	io_req_set_res(req, nop->result, 0);
	return IOU_OK;
}
Commit	Line	Data
e28683bd JA	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
e28683bd JA	10	#include "io_uring.h"
	11	#include "nop.h"
	12
deb1e496 ML	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
e28683bd JA	19	int io_nop_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
e28683bd JA	20	{
deb1e496 ML	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)
3d8f874b	26	return -EINVAL;
deb1e496 ML	27
	28	if (flags & IORING_NOP_INJECT_RESULT)
	29	nop->result = READ_ONCE(sqe->len);
	30	else
	31	nop->result = 0;
e28683bd JA	32	return 0;
	33	}
	34
e28683bd JA	35	int io_nop(struct io_kiocb *req, unsigned int issue_flags)
e28683bd JA	36	{
deb1e496 ML	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);
e28683bd JA	42	return IOU_OK;
e28683bd JA	43	}