[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 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;

	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;
	unsigned 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
	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
	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 min_events,
	28	int fio_unused max, struct timespec fio_unused *t)
	29	{
	30	struct null_data *nd = td->io_ops->data;
	31	int ret = 0;
	32
	33	if (min_events) {
	34	ret = nd->events;
	35	nd->events = 0;
	36	}
	37
	38	return ret;
	39	}
	40
	41	static int fio_null_commit(struct thread_data *td)
	42	{
	43	struct null_data *nd = td->io_ops->data;
	44
	45	nd->events += nd->queued;
	46	nd->queued = 0;
	47	return 0;
	48	}
	49
	50	static int fio_null_queue(struct thread_data fio_unused td, struct io_u io_u)
	51	{
	52	struct null_data *nd = td->io_ops->data;
	53
	54	if (td->io_ops->flags & FIO_SYNCIO)
	55	return FIO_Q_COMPLETED;
	56
	57	nd->io_us[nd->queued++] = io_u;
	58	return FIO_Q_QUEUED;
	59	}
	60
	61	static int fio_null_setup(struct thread_data *td)
	62	{
	63	struct fio_file *f;
	64	unsigned int i;
	65
	66	if (!td->total_file_size) {
	67	log_err("fio: need size= set\n");
	68	return 1;
	69	}
	70
	71	td->io_size = td->total_file_size;
	72	td->total_io_size = td->io_size;
	73
	74	for_each_file(td, f, i) {
	75	f->real_file_size = td->total_io_size / td->nr_files;
	76	f->file_size = f->real_file_size;
	77	}
	78
	79	return 0;
	80	}
	81
	82	static int fio_null_open(struct thread_data fio_unused *td,
	83	struct fio_file fio_unused *f)
	84	{
	85	f->fd = 0;
	86	return 0;
	87	}
	88
	89	static void fio_null_cleanup(struct thread_data *td)
	90	{
	91	struct null_data *nd = td->io_ops->data;
	92
	93	if (nd) {
	94	if (nd->io_us)
	95	free(nd->io_us);
	96	free(nd);
	97	td->io_ops->data = NULL;
	98	}
	99	}
	100
	101	static int fio_null_init(struct thread_data *td)
	102	{
	103	struct null_data nd = malloc(sizeof(nd));
	104
	105	memset(nd, 0, sizeof(*nd));
	106
	107	if (td->iodepth != 1) {
	108	nd->io_us = malloc(td->iodepth * sizeof(struct io_u *));
	109	memset(nd->io_us, 0, td->iodepth * sizeof(struct io_u *));
	110	} else
	111	td->io_ops->flags \|= FIO_SYNCIO;
	112
	113	td->io_ops->data = nd;
	114	return 0;
	115	}
	116
	117	static struct ioengine_ops ioengine = {
	118	.name = "null",
	119	.version = FIO_IOOPS_VERSION,
	120	.setup = fio_null_setup,
	121	.queue = fio_null_queue,
	122	.commit = fio_null_commit,
	123	.getevents = fio_null_getevents,
	124	.event = fio_null_event,
	125	.init = fio_null_init,
	126	.cleanup = fio_null_cleanup,
	127	.open_file = fio_null_open,
	128	.flags = FIO_DISKLESSIO,
	129	};
	130
	131	static void fio_init fio_null_register(void)
	132	{
	133	register_ioengine(&ioengine);
	134	}
	135
	136	static void fio_exit fio_null_unregister(void)
	137	{
	138	unregister_ioengine(&ioengine);
	139	}