[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, int min_events,
			      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) {
		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);
		td->io_ops->data = NULL;
	}
}

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
	1	/*
	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.
	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"
	15
	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
	29	static int fio_null_getevents(struct thread_data *td, int min_events,
	30	int fio_unused max, struct timespec fio_unused *t)
	31	{
	32	struct null_data *nd = td->io_ops->data;
	33	int ret = 0;
	34
	35	if (min_events) {
	36	ret = nd->events;
	37	nd->events = 0;
	38	}
	39
	40	return ret;
	41	}
	42
	43	static int fio_null_commit(struct thread_data *td)
	44	{
	45	struct null_data *nd = td->io_ops->data;
	46
	47	if (!nd->events) {
	48	nd->events = nd->queued;
	49	nd->queued = 0;
	50	}
	51
	52	return 0;
	53	}
	54
	55	static int fio_null_queue(struct thread_data fio_unused td, struct io_u io_u)
	56	{
	57	struct null_data *nd = td->io_ops->data;
	58
	59	fio_ro_check(td, io_u);
	60
	61	if (td->io_ops->flags & FIO_SYNCIO)
	62	return FIO_Q_COMPLETED;
	63	if (nd->events)
	64	return FIO_Q_BUSY;
	65
	66	nd->io_us[nd->queued++] = io_u;
	67	return FIO_Q_QUEUED;
	68	}
	69
	70	static int fio_null_open(struct thread_data fio_unused *td,
	71	struct fio_file fio_unused *f)
	72	{
	73	return 0;
	74	}
	75
	76	static void fio_null_cleanup(struct thread_data *td)
	77	{
	78	struct null_data *nd = td->io_ops->data;
	79
	80	if (nd) {
	81	if (nd->io_us)
	82	free(nd->io_us);
	83	free(nd);
	84	td->io_ops->data = NULL;
	85	}
	86	}
	87
	88	static int fio_null_init(struct thread_data *td)
	89	{
	90	struct null_data nd = malloc(sizeof(nd));
	91
	92	memset(nd, 0, sizeof(*nd));
	93
	94	if (td->o.iodepth != 1) {
	95	nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
	96	memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
	97	} else
	98	td->io_ops->flags \|= FIO_SYNCIO;
	99
	100	td->io_ops->data = nd;
	101	return 0;
	102	}
	103
	104	static struct ioengine_ops ioengine = {
	105	.name = "null",
	106	.version = FIO_IOOPS_VERSION,
	107	.queue = fio_null_queue,
	108	.commit = fio_null_commit,
	109	.getevents = fio_null_getevents,
	110	.event = fio_null_event,
	111	.init = fio_null_init,
	112	.cleanup = fio_null_cleanup,
	113	.open_file = fio_null_open,
	114	.flags = FIO_DISKLESSIO,
	115	};
	116
	117	static void fio_init fio_null_register(void)
	118	{
	119	register_ioengine(&ioengine);
	120	}
	121
	122	static void fio_exit fio_null_unregister(void)
	123	{
	124	unregister_ioengine(&ioengine);
	125	}