[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.
 *
 * It also can act as external C++ engine - compiled with:
 *
 * g++ -O2 -g -shared -rdynamic -fPIC -o null.so null.c -DFIO_EXTERNAL_ENGINE
 *
 */
#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 = (struct null_data *) 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 = (struct null_data *) 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 = (struct null_data *) td->io_ops->data;

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

	return 0;
}

static int fio_null_queue(struct thread_data *td, struct io_u *io_u)
{
	struct null_data *nd = (struct null_data *) 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 = (struct null_data *) 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 = (struct null_data *) malloc(sizeof(*nd));

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

	if (td->o.iodepth != 1) {
		nd->io_us = (struct io_u **) 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;
}

#ifndef __cplusplus
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 | FIO_FAKEIO,
};

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

static void fio_exit fio_null_unregister(void)
{
	unregister_ioengine(&ioengine);
}

#else

#ifdef FIO_EXTERNAL_ENGINE
extern "C" {
void get_ioengine(struct ioengine_ops **ioengine_ptr)
{
	struct ioengine_ops *ioengine;

	*ioengine_ptr = (struct ioengine_ops *) malloc(sizeof(struct ioengine_ops));
	ioengine = *ioengine_ptr;

	strcpy(ioengine->name, "cpp_null");
	ioengine->version        = FIO_IOOPS_VERSION;
	ioengine->queue          = fio_null_queue;
	ioengine->commit         = fio_null_commit;
	ioengine->getevents      = fio_null_getevents;
	ioengine->event          = fio_null_event;
	ioengine->init           = fio_null_init;
	ioengine->cleanup        = fio_null_cleanup;
	ioengine->open_file      = fio_null_open;
	ioengine->flags	         = FIO_DISKLESSIO | FIO_FAKEIO;
}
}
#endif /* FIO_EXTERNAL_ENGINE */

#endif /* __cplusplus */
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	* It also can act as external C++ engine - compiled with:
	8	*
	9	* g++ -O2 -g -shared -rdynamic -fPIC -o null.so null.c -DFIO_EXTERNAL_ENGINE
	10	*
	11	*/
	12	#include <stdio.h>
	13	#include <stdlib.h>
	14	#include <unistd.h>
	15	#include <errno.h>
	16	#include <assert.h>
	17
	18	#include "../fio.h"
	19
	20	struct null_data {
	21	struct io_u **io_us;
	22	int queued;
	23	int events;
	24	};
	25
	26	static struct io_u fio_null_event(struct thread_data td, int event)
	27	{
	28	struct null_data nd = (struct null_data ) td->io_ops->data;
	29
	30	return nd->io_us[event];
	31	}
	32
	33	static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
	34	unsigned int fio_unused max,
	35	struct timespec fio_unused *t)
	36	{
	37	struct null_data nd = (struct null_data ) td->io_ops->data;
	38	int ret = 0;
	39
	40	if (min_events) {
	41	ret = nd->events;
	42	nd->events = 0;
	43	}
	44
	45	return ret;
	46	}
	47
	48	static int fio_null_commit(struct thread_data *td)
	49	{
	50	struct null_data nd = (struct null_data ) td->io_ops->data;
	51
	52	if (!nd->events) {
	53	#ifndef FIO_EXTERNAL_ENGINE
	54	io_u_mark_submit(td, nd->queued);
	55	#endif
	56	nd->events = nd->queued;
	57	nd->queued = 0;
	58	}
	59
	60	return 0;
	61	}
	62
	63	static int fio_null_queue(struct thread_data td, struct io_u io_u)
	64	{
	65	struct null_data nd = (struct null_data ) td->io_ops->data;
	66
	67	fio_ro_check(td, io_u);
	68
	69	if (td->io_ops->flags & FIO_SYNCIO)
	70	return FIO_Q_COMPLETED;
	71	if (nd->events)
	72	return FIO_Q_BUSY;
	73
	74	nd->io_us[nd->queued++] = io_u;
	75	return FIO_Q_QUEUED;
	76	}
	77
	78	static int fio_null_open(struct thread_data fio_unused *td,
	79	struct fio_file fio_unused *f)
	80	{
	81	return 0;
	82	}
	83
	84	static void fio_null_cleanup(struct thread_data *td)
	85	{
	86	struct null_data nd = (struct null_data ) td->io_ops->data;
	87
	88	if (nd) {
	89	if (nd->io_us)
	90	free(nd->io_us);
	91	free(nd);
	92	}
	93	}
	94
	95	static int fio_null_init(struct thread_data *td)
	96	{
	97	struct null_data nd = (struct null_data ) malloc(sizeof(*nd));
	98
	99	memset(nd, 0, sizeof(*nd));
	100
	101	if (td->o.iodepth != 1) {
	102	nd->io_us = (struct io_u *) malloc(td->o.iodepth sizeof(struct io_u *));
	103	memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
	104	} else
	105	td->io_ops->flags \|= FIO_SYNCIO;
	106
	107	td->io_ops->data = nd;
	108	return 0;
	109	}
	110
	111	#ifndef __cplusplus
	112	static struct ioengine_ops ioengine = {
	113	.name = "null",
	114	.version = FIO_IOOPS_VERSION,
	115	.queue = fio_null_queue,
	116	.commit = fio_null_commit,
	117	.getevents = fio_null_getevents,
	118	.event = fio_null_event,
	119	.init = fio_null_init,
	120	.cleanup = fio_null_cleanup,
	121	.open_file = fio_null_open,
	122	.flags = FIO_DISKLESSIO \| FIO_FAKEIO,
	123	};
	124
	125	static void fio_init fio_null_register(void)
	126	{
	127	register_ioengine(&ioengine);
	128	}
	129
	130	static void fio_exit fio_null_unregister(void)
	131	{
	132	unregister_ioengine(&ioengine);
	133	}
	134
	135	#else
	136
	137	#ifdef FIO_EXTERNAL_ENGINE
	138	extern "C" {
	139	void get_ioengine(struct ioengine_ops **ioengine_ptr)
	140	{
	141	struct ioengine_ops *ioengine;
	142
	143	ioengine_ptr = (struct ioengine_ops ) malloc(sizeof(struct ioengine_ops));
	144	ioengine = *ioengine_ptr;
	145
	146	strcpy(ioengine->name, "cpp_null");
	147	ioengine->version = FIO_IOOPS_VERSION;
	148	ioengine->queue = fio_null_queue;
	149	ioengine->commit = fio_null_commit;
	150	ioengine->getevents = fio_null_getevents;
	151	ioengine->event = fio_null_event;
	152	ioengine->init = fio_null_init;
	153	ioengine->cleanup = fio_null_cleanup;
	154	ioengine->open_file = fio_null_open;
	155	ioengine->flags = FIO_DISKLESSIO \| FIO_FAKEIO;
	156	}
	157	}
	158	#endif /* FIO_EXTERNAL_ENGINE */
	159
	160	#endif /* __cplusplus */