[fio.git] / engines / filestat.c

/*
 * filestat engine
 *
 * IO engine that doesn't do any IO, just stat files and tracks the latency
 * of the file stat.
 */
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "../fio.h"

struct fc_data {
	enum fio_ddir stat_ddir;
};

static int stat_file(struct thread_data *td, struct fio_file *f)
{
	struct timespec start;
	int do_lat = !td->o.disable_lat;
	struct stat statbuf;
	int ret;

	dprint(FD_FILE, "fd stat %s\n", f->file_name);

	if (f->filetype != FIO_TYPE_FILE) {
		log_err("fio: only files are supported\n");
		return 1;
	}
	if (!strcmp(f->file_name, "-")) {
		log_err("fio: can't read/write to stdin/out\n");
		return 1;
	}

	if (do_lat)
		fio_gettime(&start, NULL);

	ret = stat(f->file_name, &statbuf);

	if (ret == -1) {
		char buf[FIO_VERROR_SIZE];
		int e = errno;

		snprintf(buf, sizeof(buf), "stat(%s)", f->file_name);
		td_verror(td, e, buf);
		return 1;
	}

	if (do_lat) {
		struct fc_data *data = td->io_ops_data;
		uint64_t nsec;

		nsec = ntime_since_now(&start);
		add_clat_sample(td, data->stat_ddir, nsec, 0, 0, 0);
	}

	return 0;
}

static enum fio_q_status queue_io(struct thread_data *td, struct io_u fio_unused *io_u)
{
	return FIO_Q_COMPLETED;
}

static int init(struct thread_data *td)
{
	struct fc_data *data;

	data = calloc(1, sizeof(*data));

	if (td_read(td))
		data->stat_ddir = DDIR_READ;
	else if (td_write(td))
		data->stat_ddir = DDIR_WRITE;

	td->io_ops_data = data;
	return 0;
}

static void cleanup(struct thread_data *td)
{
	struct fc_data *data = td->io_ops_data;

	free(data);
}

static int stat_invalidate(struct thread_data *td, struct fio_file *f)
{
	/* do nothing because file not opened */
	return 0;
}

static struct ioengine_ops ioengine = {
	.name		= "filestat",
	.version	= FIO_IOOPS_VERSION,
	.init		= init,
	.cleanup	= cleanup,
	.queue		= queue_io,
	.invalidate	= stat_invalidate,
	.get_file_size	= generic_get_file_size,
	.open_file	= stat_file,
	.flags		=  FIO_SYNCIO | FIO_FAKEIO |
				FIO_NOSTATS | FIO_NOFILEHASH,
};

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

static void fio_exit fio_filestat_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
73ccd14e SF	1	/*
	2	* filestat engine
	3	*
	4	* IO engine that doesn't do any IO, just stat files and tracks the latency
	5	* of the file stat.
	6	*/
	7	#include <stdio.h>
	8	#include <fcntl.h>
	9	#include <errno.h>
	10	#include <sys/types.h>
	11	#include <sys/stat.h>
	12	#include <unistd.h>
	13	#include "../fio.h"
	14
	15	struct fc_data {
	16	enum fio_ddir stat_ddir;
	17	};
	18
	19	static int stat_file(struct thread_data td, struct fio_file f)
	20	{
	21	struct timespec start;
	22	int do_lat = !td->o.disable_lat;
	23	struct stat statbuf;
	24	int ret;
	25
	26	dprint(FD_FILE, "fd stat %s\n", f->file_name);
	27
	28	if (f->filetype != FIO_TYPE_FILE) {
	29	log_err("fio: only files are supported\n");
	30	return 1;
	31	}
	32	if (!strcmp(f->file_name, "-")) {
	33	log_err("fio: can't read/write to stdin/out\n");
	34	return 1;
	35	}
	36
	37	if (do_lat)
	38	fio_gettime(&start, NULL);
	39
	40	ret = stat(f->file_name, &statbuf);
	41
	42	if (ret == -1) {
	43	char buf[FIO_VERROR_SIZE];
	44	int e = errno;
	45
	46	snprintf(buf, sizeof(buf), "stat(%s)", f->file_name);
	47	td_verror(td, e, buf);
	48	return 1;
	49	}
	50
	51	if (do_lat) {
	52	struct fc_data *data = td->io_ops_data;
	53	uint64_t nsec;
	54
	55	nsec = ntime_since_now(&start);
b2a432bf	56	add_clat_sample(td, data->stat_ddir, nsec, 0, 0, 0);
73ccd14e SF	57	}
	58
	59	return 0;
	60	}
	61
	62	static enum fio_q_status queue_io(struct thread_data td, struct io_u fio_unused io_u)
	63	{
	64	return FIO_Q_COMPLETED;
	65	}
	66
	67	static int init(struct thread_data *td)
	68	{
	69	struct fc_data *data;
	70
	71	data = calloc(1, sizeof(*data));
	72
	73	if (td_read(td))
	74	data->stat_ddir = DDIR_READ;
	75	else if (td_write(td))
	76	data->stat_ddir = DDIR_WRITE;
	77
	78	td->io_ops_data = data;
	79	return 0;
	80	}
	81
	82	static void cleanup(struct thread_data *td)
	83	{
	84	struct fc_data *data = td->io_ops_data;
	85
	86	free(data);
	87	}
	88
	89	static int stat_invalidate(struct thread_data td, struct fio_file f)
	90	{
	91	/* do nothing because file not opened */
	92	return 0;
	93	}
	94
	95	static struct ioengine_ops ioengine = {
	96	.name = "filestat",
	97	.version = FIO_IOOPS_VERSION,
	98	.init = init,
	99	.cleanup = cleanup,
	100	.queue = queue_io,
	101	.invalidate = stat_invalidate,
	102	.get_file_size = generic_get_file_size,
	103	.open_file = stat_file,
	104	.flags = FIO_SYNCIO \| FIO_FAKEIO \|
	105	FIO_NOSTATS \| FIO_NOFILEHASH,
	106	};
	107
	108	static void fio_init fio_filestat_register(void)
	109	{
	110	register_ioengine(&ioengine);
	111	}
	112
	113	static void fio_exit fio_filestat_unregister(void)
	114	{
	115	unregister_ioengine(&ioengine);
	116	}