[fio.git] / engines / null.c

/*
 * null engine
 *
 * IO engine that doesn't do any real IO transfers, it just pretends to.
 * The main purpose is to test fio itself.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>

#include "../fio.h"

struct null_data {
	struct io_u **io_us;
	int queued;
	int events;
};

static struct io_u *fio_null_event(struct thread_data *td, int event)
{
	struct null_data *nd = td->io_ops->data;

	return nd->io_us[event];
}

static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
			      unsigned int fio_unused max,
			      struct timespec fio_unused *t)
{
	struct null_data *nd = td->io_ops->data;
	int ret = 0;
	
	if (min_events) {
		ret = nd->events;
		nd->events = 0;
	}

	return ret;
}

static int fio_null_commit(struct thread_data *td)
{
	struct null_data *nd = td->io_ops->data;

	if (!nd->events) {
		io_u_mark_submit(td, nd->queued);
		nd->events = nd->queued;
		nd->queued = 0;
	}

	return 0;
}

static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u)
{
	struct null_data *nd = td->io_ops->data;

	fio_ro_check(td, io_u);

	if (td->io_ops->flags & FIO_SYNCIO)
		return FIO_Q_COMPLETED;
	if (nd->events)
		return FIO_Q_BUSY;

	nd->io_us[nd->queued++] = io_u;
	return FIO_Q_QUEUED;
}

static int fio_null_open(struct thread_data fio_unused *td,
			 struct fio_file fio_unused *f)
{
	return 0;
}

static void fio_null_cleanup(struct thread_data *td)
{
	struct null_data *nd = td->io_ops->data;

	if (nd) {
		if (nd->io_us)
			free(nd->io_us);
		free(nd);
	}
}

static int fio_null_init(struct thread_data *td)
{
	struct null_data *nd = malloc(sizeof(*nd));

	memset(nd, 0, sizeof(*nd));

	if (td->o.iodepth != 1) {
		nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
		memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
	} else
		td->io_ops->flags |= FIO_SYNCIO;

	td->io_ops->data = nd;
	return 0;
}

static struct ioengine_ops ioengine = {
	.name		= "null",
	.version	= FIO_IOOPS_VERSION,
	.queue		= fio_null_queue,
	.commit		= fio_null_commit,
	.getevents	= fio_null_getevents,
	.event		= fio_null_event,
	.init		= fio_null_init,
	.cleanup	= fio_null_cleanup,
	.open_file	= fio_null_open,
	.flags		= FIO_DISKLESSIO,
};

static void fio_init fio_null_register(void)
{
	register_ioengine(&ioengine);
}

static void fio_exit fio_null_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
a94ea28b	1	/*
da751ca9 JA	2	* null engine
	3	*
	4	* IO engine that doesn't do any real IO transfers, it just pretends to.
	5	* The main purpose is to test fio itself.
a94ea28b JA	6	*
	7	*/
	8	#include <stdio.h>
	9	#include <stdlib.h>
	10	#include <unistd.h>
	11	#include <errno.h>
	12	#include <assert.h>
	13
	14	#include "../fio.h"
a94ea28b	15
65afa5f2 JA	16	struct null_data {
	17	struct io_u **io_us;
	18	int queued;
	19	int events;
	20	};
	21
	22	static struct io_u fio_null_event(struct thread_data td, int event)
	23	{
	24	struct null_data *nd = td->io_ops->data;
	25
	26	return nd->io_us[event];
	27	}
	28
e7d2e616 JA	29	static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
	30	unsigned int fio_unused max,
	31	struct timespec fio_unused *t)
65afa5f2 JA	32	{
65afa5f2 JA	33	struct null_data *nd = td->io_ops->data;
7401c088 JA	34	int ret = 0;
	35
	36	if (min_events) {
	37	ret = nd->events;
	38	nd->events = 0;
	39	}
65afa5f2	40
65afa5f2 JA	41	return ret;
	42	}
	43
	44	static int fio_null_commit(struct thread_data *td)
	45	{
	46	struct null_data *nd = td->io_ops->data;
	47
ed8bd849	48	if (!nd->events) {
838bc709	49	io_u_mark_submit(td, nd->queued);
ed8bd849 JA	50	nd->events = nd->queued;
	51	nd->queued = 0;
	52	}
	53
65afa5f2 JA	54	return 0;
	55	}
	56
36167d82	57	static int fio_null_queue(struct thread_data fio_unused td, struct io_u io_u)
a94ea28b	58	{
65afa5f2 JA	59	struct null_data *nd = td->io_ops->data;
65afa5f2 JA	60
7101d9c2 JA	61	fio_ro_check(td, io_u);
7101d9c2 JA	62
65afa5f2 JA	63	if (td->io_ops->flags & FIO_SYNCIO)
65afa5f2 JA	64	return FIO_Q_COMPLETED;
ed8bd849 JA	65	if (nd->events)
ed8bd849 JA	66	return FIO_Q_BUSY;
65afa5f2 JA	67
	68	nd->io_us[nd->queued++] = io_u;
	69	return FIO_Q_QUEUED;
a94ea28b JA	70	}
a94ea28b JA	71
b5af8293 JA	72	static int fio_null_open(struct thread_data fio_unused *td,
	73	struct fio_file fio_unused *f)
	74	{
	75	return 0;
	76	}
	77
65afa5f2 JA	78	static void fio_null_cleanup(struct thread_data *td)
	79	{
	80	struct null_data *nd = td->io_ops->data;
	81
	82	if (nd) {
	83	if (nd->io_us)
	84	free(nd->io_us);
	85	free(nd);
65afa5f2 JA	86	}
	87	}
	88
	89	static int fio_null_init(struct thread_data *td)
	90	{
	91	struct null_data nd = malloc(sizeof(nd));
	92
	93	memset(nd, 0, sizeof(*nd));
	94
2dc1bbeb JA	95	if (td->o.iodepth != 1) {
	96	nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
	97	memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
65afa5f2 JA	98	} else
	99	td->io_ops->flags \|= FIO_SYNCIO;
	100
	101	td->io_ops->data = nd;
	102	return 0;
	103	}
	104
a94ea28b JA	105	static struct ioengine_ops ioengine = {
	106	.name = "null",
	107	.version = FIO_IOOPS_VERSION,
a94ea28b	108	.queue = fio_null_queue,
65afa5f2 JA	109	.commit = fio_null_commit,
	110	.getevents = fio_null_getevents,
	111	.event = fio_null_event,
	112	.init = fio_null_init,
	113	.cleanup = fio_null_cleanup,
b5af8293	114	.open_file = fio_null_open,
65afa5f2	115	.flags = FIO_DISKLESSIO,
a94ea28b JA	116	};
	117
	118	static void fio_init fio_null_register(void)
	119	{
	120	register_ioengine(&ioengine);
	121	}
	122
	123	static void fio_exit fio_null_unregister(void)
	124	{
	125	unregister_ioengine(&ioengine);
	126	}