[fio.git] / engines / null.c

/*
 * null engine - doesn't do any transfers. Used to test fio.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>

#include "../fio.h"
#include "../os.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 fio_unused min,
			      int fio_unused max, struct timespec fio_unused *t)
{
	struct null_data *nd = td->io_ops->data;
	int ret;

	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;

	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;

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

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

static int fio_null_setup(struct thread_data *td)
{
	struct fio_file *f;
	int i;

	if (!td->total_file_size) {
		log_err("fio: need size= set\n");
		return 1;
	}

	td->io_size = td->total_file_size;
	td->total_io_size = td->io_size;

	for_each_file(td, f, i) {
		f->real_file_size = td->total_io_size / td->nr_files;
		f->file_size = f->real_file_size;
	}

	return 0;
}

static int fio_null_open(struct thread_data fio_unused *td,
			 struct fio_file fio_unused *f)
{
	f->fd = 0;
	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->iodepth != 1) {
		nd->io_us = malloc(td->iodepth * sizeof(struct io_u *));
		memset(nd->io_us, 0, td->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,
	.setup		= fio_null_setup,
	.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 JA	1	/*
	2	* null engine - doesn't do any transfers. Used to test fio.
	3	*
	4	*/
	5	#include <stdio.h>
	6	#include <stdlib.h>
	7	#include <unistd.h>
	8	#include <errno.h>
	9	#include <assert.h>
	10
	11	#include "../fio.h"
	12	#include "../os.h"
	13
65afa5f2 JA	14	struct null_data {
	15	struct io_u **io_us;
	16	int queued;
	17	int events;
	18	};
	19
	20	static struct io_u fio_null_event(struct thread_data td, int event)
	21	{
	22	struct null_data *nd = td->io_ops->data;
	23
	24	return nd->io_us[event];
	25	}
	26
	27	static int fio_null_getevents(struct thread_data *td, int fio_unused min,
	28	int fio_unused max, struct timespec fio_unused *t)
	29	{
	30	struct null_data *nd = td->io_ops->data;
	31	int ret;
	32
	33	ret = nd->events;
	34	nd->events = 0;
	35	return ret;
	36	}
	37
	38	static int fio_null_commit(struct thread_data *td)
	39	{
	40	struct null_data *nd = td->io_ops->data;
	41
	42	nd->events = nd->queued;
	43	nd->queued = 0;
	44	return 0;
	45	}
	46
36167d82	47	static int fio_null_queue(struct thread_data fio_unused td, struct io_u io_u)
a94ea28b	48	{
65afa5f2 JA	49	struct null_data *nd = td->io_ops->data;
	50
	51	if (td->io_ops->flags & FIO_SYNCIO)
	52	return FIO_Q_COMPLETED;
	53
	54	nd->io_us[nd->queued++] = io_u;
	55	return FIO_Q_QUEUED;
a94ea28b JA	56	}
a94ea28b JA	57
2fd233b7 JA	58	static int fio_null_setup(struct thread_data *td)
	59	{
	60	struct fio_file *f;
	61	int i;
	62
	63	if (!td->total_file_size) {
	64	log_err("fio: need size= set\n");
	65	return 1;
	66	}
	67
	68	td->io_size = td->total_file_size;
	69	td->total_io_size = td->io_size;
	70
	71	for_each_file(td, f, i) {
2fd233b7 JA	72	f->real_file_size = td->total_io_size / td->nr_files;
	73	f->file_size = f->real_file_size;
	74	}
	75
2fd233b7 JA	76	return 0;
	77	}
	78
b5af8293 JA	79	static int fio_null_open(struct thread_data fio_unused *td,
	80	struct fio_file fio_unused *f)
	81	{
640e9421	82	f->fd = 0;
b5af8293 JA	83	return 0;
	84	}
	85
65afa5f2 JA	86	static void fio_null_cleanup(struct thread_data *td)
	87	{
	88	struct null_data *nd = td->io_ops->data;
	89
	90	if (nd) {
	91	if (nd->io_us)
	92	free(nd->io_us);
	93	free(nd);
	94	td->io_ops->data = NULL;
	95	}
	96	}
	97
	98	static int fio_null_init(struct thread_data *td)
	99	{
	100	struct null_data nd = malloc(sizeof(nd));
	101
	102	memset(nd, 0, sizeof(*nd));
	103
	104	if (td->iodepth != 1) {
	105	nd->io_us = malloc(td->iodepth * sizeof(struct io_u *));
	106	memset(nd->io_us, 0, td->iodepth * sizeof(struct io_u *));
	107	} else
	108	td->io_ops->flags \|= FIO_SYNCIO;
	109
	110	td->io_ops->data = nd;
	111	return 0;
	112	}
	113
a94ea28b JA	114	static struct ioengine_ops ioengine = {
	115	.name = "null",
	116	.version = FIO_IOOPS_VERSION,
2fd233b7	117	.setup = fio_null_setup,
a94ea28b	118	.queue = fio_null_queue,
65afa5f2 JA	119	.commit = fio_null_commit,
	120	.getevents = fio_null_getevents,
	121	.event = fio_null_event,
	122	.init = fio_null_init,
	123	.cleanup = fio_null_cleanup,
b5af8293	124	.open_file = fio_null_open,
65afa5f2	125	.flags = FIO_DISKLESSIO,
a94ea28b JA	126	};
	127
	128	static void fio_init fio_null_register(void)
	129	{
	130	register_ioengine(&ioengine);
	131	}
	132
	133	static void fio_exit fio_null_unregister(void)
	134	{
	135	unregister_ioengine(&ioengine);
	136	}