[fio.git] / engines / sync.c

/*
 * sync/psync engine
 *
 * IO engine that does regular read(2)/write(2) with lseek(2) to transfer
 * data and IO engine that does regular pread(2)/pwrite(2) to transfer data.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>

#include "../fio.h"

struct syncio_data {
	struct iovec *iovecs;
	struct io_u **io_us;
	unsigned int queued;
	unsigned long queued_bytes;

	unsigned long long last_offset;
	struct fio_file *last_file;
	enum fio_ddir last_ddir;
};

static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;

	if (io_u->ddir == DDIR_SYNC)
		return 0;
	if (io_u->offset == f->last_completed_pos)
		return 0;

	if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) {
		td_verror(td, errno, "lseek");
		return 1;
	}

	return 0;
}

static int fio_io_end(struct thread_data *td, struct io_u *io_u, int ret)
{
	if (ret != (int) io_u->xfer_buflen) {
		if (ret >= 0) {
			io_u->resid = io_u->xfer_buflen - ret;
			io_u->error = 0;
			return FIO_Q_COMPLETED;
		} else
			io_u->error = errno;
	}

	if (io_u->error)
		td_verror(td, io_u->error, "xfer");

	return FIO_Q_COMPLETED;
}

static int fio_psyncio_queue(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	int ret;

	fio_ro_check(td, io_u);

	if (io_u->ddir == DDIR_READ)
		ret = pread(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	else if (io_u->ddir == DDIR_WRITE)
		ret = pwrite(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	else
		ret = fsync(f->fd);

	return fio_io_end(td, io_u, ret);
}

static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	int ret;

	fio_ro_check(td, io_u);

	if (io_u->ddir == DDIR_READ)
		ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
	else if (io_u->ddir == DDIR_WRITE)
		ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
	else
		ret = fsync(f->fd);

	return fio_io_end(td, io_u, ret);
}

static int fio_vsyncio_getevents(struct thread_data *td, unsigned int min,
				 unsigned int max,
				 struct timespec fio_unused *t)
{
	struct syncio_data *sd = td->io_ops->data;
	int ret;

	if (min) {
		ret = sd->queued;
		sd->queued = 0;
	} else
		ret = 0;

	dprint(FD_IO, "vsyncio_getevents: min=%d,max=%d: %d\n", min, max, ret);
	return ret;
}

static struct io_u *fio_vsyncio_event(struct thread_data *td, int event)
{
	struct syncio_data *sd = td->io_ops->data;

	return sd->io_us[event];
}

static int fio_vsyncio_append(struct thread_data *td, struct io_u *io_u)
{
	struct syncio_data *sd = td->io_ops->data;

	if (io_u->ddir == DDIR_SYNC)
		return 0;

	if (io_u->offset == sd->last_offset && io_u->file == sd->last_file &&
	    io_u->ddir == sd->last_ddir)
		return 1;

	return 0;
}

static void fio_vsyncio_set_iov(struct syncio_data *sd, struct io_u *io_u,
				int index)
{
	sd->io_us[index] = io_u;
	sd->iovecs[index].iov_base = io_u->xfer_buf;
	sd->iovecs[index].iov_len = io_u->xfer_buflen;
	sd->last_offset = io_u->offset + io_u->xfer_buflen;
	sd->last_file = io_u->file;
	sd->last_ddir = io_u->ddir;
	sd->queued_bytes += io_u->xfer_buflen;
	sd->queued++;
}

static int fio_vsyncio_queue(struct thread_data *td, struct io_u *io_u)
{
	struct syncio_data *sd = td->io_ops->data;

	fio_ro_check(td, io_u);

	if (!fio_vsyncio_append(td, io_u)) {
		dprint(FD_IO, "vsyncio_queue: no append (%d)\n", sd->queued);
		/*
		 * If we can't append and have stuff queued, tell fio to
		 * commit those first and then retry this io
		 */
		if (sd->queued)
			return FIO_Q_BUSY;
		if (io_u->ddir == DDIR_SYNC) {
			int ret = fsync(io_u->file->fd);

			return fio_io_end(td, io_u, ret);
		}

		sd->queued = 0;
		sd->queued_bytes = 0;
		fio_vsyncio_set_iov(sd, io_u, 0);
	} else {
		if (sd->queued == td->o.iodepth) {
			dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
			return FIO_Q_BUSY;
		}

		dprint(FD_IO, "vsyncio_queue: append\n");
		fio_vsyncio_set_iov(sd, io_u, sd->queued);
	}

	dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
	return FIO_Q_QUEUED;
}

/*
 * Check that we transferred all bytes, or saw an error, etc
 */
static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
{
	struct syncio_data *sd = td->io_ops->data;
	struct io_u *io_u;
	unsigned int i;
	int err;

	/*
	 * transferred everything, perfect
	 */
	if (bytes == sd->queued_bytes)
		return 0;

	err = errno;
	for (i = 0; i < sd->queued; i++) {
		io_u = sd->io_us[i];

		if (bytes == -1) {
			io_u->error = err;
		} else {
			unsigned int this_io;

			this_io = bytes;
			if (this_io > io_u->xfer_buflen)
				this_io = io_u->xfer_buflen;

			io_u->resid = io_u->xfer_buflen - this_io;
			io_u->error = 0;
			bytes -= this_io;
		}
	}

	if (bytes == -1) {
		td_verror(td, err, "xfer vsync");
		return -err;
	}

	return 0;
}

static int fio_vsyncio_commit(struct thread_data *td)
{
	struct syncio_data *sd = td->io_ops->data;
	struct fio_file *f;
	ssize_t ret;

	if (!sd->queued)
		return 0;

	f = sd->last_file;

	if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
		int err = -errno;

		td_verror(td, errno, "lseek");
		return err;
	}

	if (sd->last_ddir == DDIR_READ)
		ret = readv(f->fd, sd->iovecs, sd->queued);
	else
		ret = writev(f->fd, sd->iovecs, sd->queued);

	dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
	return fio_vsyncio_end(td, ret);
}

static int fio_vsyncio_init(struct thread_data *td)
{
	struct syncio_data *sd;

	sd = malloc(sizeof(*sd));
	memset(sd, 0, sizeof(*sd));
	sd->last_offset = -1ULL;
	sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
	sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));

	td->io_ops->data = sd;
	return 0;
}

static void fio_vsyncio_cleanup(struct thread_data *td)
{
	struct syncio_data *sd = td->io_ops->data;

	free(sd->iovecs);
	free(sd->io_us);
	free(sd);
	td->io_ops->data = NULL;
}

static struct ioengine_ops ioengine_rw = {
	.name		= "sync",
	.version	= FIO_IOOPS_VERSION,
	.prep		= fio_syncio_prep,
	.queue		= fio_syncio_queue,
	.open_file	= generic_open_file,
	.close_file	= generic_close_file,
	.flags		= FIO_SYNCIO,
};

static struct ioengine_ops ioengine_prw = {
	.name		= "psync",
	.version	= FIO_IOOPS_VERSION,
	.queue		= fio_psyncio_queue,
	.open_file	= generic_open_file,
	.close_file	= generic_close_file,
	.flags		= FIO_SYNCIO,
};

static struct ioengine_ops ioengine_vrw = {
	.name		= "vsync",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_vsyncio_init,
	.cleanup	= fio_vsyncio_cleanup,
	.queue		= fio_vsyncio_queue,
	.commit		= fio_vsyncio_commit,
	.event		= fio_vsyncio_event,
	.getevents	= fio_vsyncio_getevents,
	.open_file	= generic_open_file,
	.close_file	= generic_close_file,
	.flags		= FIO_SYNCIO,
};

static void fio_init fio_syncio_register(void)
{
	register_ioengine(&ioengine_rw);
	register_ioengine(&ioengine_prw);
	register_ioengine(&ioengine_vrw);
}

static void fio_exit fio_syncio_unregister(void)
{
	unregister_ioengine(&ioengine_rw);
	unregister_ioengine(&ioengine_prw);
	unregister_ioengine(&ioengine_vrw);
}
Commit	Line	Data
2866c82d	1	/*
a31041ea	2	* sync/psync engine
da751ca9 JA	3	*
da751ca9 JA	4	* IO engine that does regular read(2)/write(2) with lseek(2) to transfer
a31041ea	5	* data and IO engine that does regular pread(2)/pwrite(2) to transfer data.
2866c82d JA	6	*
	7	*/
	8	#include <stdio.h>
	9	#include <stdlib.h>
	10	#include <unistd.h>
	11	#include <errno.h>
	12	#include <assert.h>
5f350952 JA	13
5f350952 JA	14	#include "../fio.h"
2866c82d	15
1d2af02a JA	16	struct syncio_data {
	17	struct iovec *iovecs;
	18	struct io_u **io_us;
	19	unsigned int queued;
	20	unsigned long queued_bytes;
	21
	22	unsigned long long last_offset;
	23	struct fio_file *last_file;
	24	enum fio_ddir last_ddir;
	25	};
	26
2866c82d JA	27	static int fio_syncio_prep(struct thread_data td, struct io_u io_u)
2866c82d JA	28	{
53cdc686 JA	29	struct fio_file *f = io_u->file;
53cdc686 JA	30
87dc1ab1 JA	31	if (io_u->ddir == DDIR_SYNC)
87dc1ab1 JA	32	return 0;
02bcaa8c JA	33	if (io_u->offset == f->last_completed_pos)
02bcaa8c JA	34	return 0;
87dc1ab1	35
53cdc686	36	if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) {
e1161c32	37	td_verror(td, errno, "lseek");
2866c82d JA	38	return 1;
	39	}
	40
	41	return 0;
	42	}
	43
2bd3eabc	44	static int fio_io_end(struct thread_data td, struct io_u io_u, int ret)
2866c82d	45	{
cec6b55d	46	if (ret != (int) io_u->xfer_buflen) {
22819ec2	47	if (ret >= 0) {
cec6b55d JA	48	io_u->resid = io_u->xfer_buflen - ret;
cec6b55d JA	49	io_u->error = 0;
36167d82	50	return FIO_Q_COMPLETED;
2866c82d JA	51	} else
	52	io_u->error = errno;
	53	}
	54
36167d82	55	if (io_u->error)
e1161c32	56	td_verror(td, io_u->error, "xfer");
2866c82d	57
36167d82	58	return FIO_Q_COMPLETED;
2866c82d JA	59	}
2866c82d JA	60
2bd3eabc	61	static int fio_psyncio_queue(struct thread_data td, struct io_u io_u)
a31041ea	62	{
2bd3eabc JA	63	struct fio_file *f = io_u->file;
	64	int ret;
	65
	66	fio_ro_check(td, io_u);
	67
	68	if (io_u->ddir == DDIR_READ)
	69	ret = pread(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	70	else if (io_u->ddir == DDIR_WRITE)
	71	ret = pwrite(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	72	else
	73	ret = fsync(f->fd);
	74
	75	return fio_io_end(td, io_u, ret);
	76	}
	77
	78	static int fio_syncio_queue(struct thread_data td, struct io_u io_u)
	79	{
	80	struct fio_file *f = io_u->file;
	81	int ret;
	82
	83	fio_ro_check(td, io_u);
	84
	85	if (io_u->ddir == DDIR_READ)
	86	ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
	87	else if (io_u->ddir == DDIR_WRITE)
	88	ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
	89	else
	90	ret = fsync(f->fd);
	91
	92	return fio_io_end(td, io_u, ret);
a31041ea	93	}
a31041ea	94
1d2af02a JA	95	static int fio_vsyncio_getevents(struct thread_data *td, unsigned int min,
	96	unsigned int max,
	97	struct timespec fio_unused *t)
	98	{
	99	struct syncio_data *sd = td->io_ops->data;
	100	int ret;
	101
	102	if (min) {
	103	ret = sd->queued;
	104	sd->queued = 0;
	105	} else
	106	ret = 0;
	107
	108	dprint(FD_IO, "vsyncio_getevents: min=%d,max=%d: %d\n", min, max, ret);
	109	return ret;
	110	}
	111
	112	static struct io_u fio_vsyncio_event(struct thread_data td, int event)
	113	{
	114	struct syncio_data *sd = td->io_ops->data;
	115
	116	return sd->io_us[event];
	117	}
	118
	119	static int fio_vsyncio_append(struct thread_data td, struct io_u io_u)
	120	{
	121	struct syncio_data *sd = td->io_ops->data;
	122
	123	if (io_u->ddir == DDIR_SYNC)
	124	return 0;
	125
	126	if (io_u->offset == sd->last_offset && io_u->file == sd->last_file &&
	127	io_u->ddir == sd->last_ddir)
	128	return 1;
	129
	130	return 0;
	131	}
	132
	133	static void fio_vsyncio_set_iov(struct syncio_data sd, struct io_u io_u,
	134	int index)
	135	{
	136	sd->io_us[index] = io_u;
	137	sd->iovecs[index].iov_base = io_u->xfer_buf;
	138	sd->iovecs[index].iov_len = io_u->xfer_buflen;
	139	sd->last_offset = io_u->offset + io_u->xfer_buflen;
	140	sd->last_file = io_u->file;
	141	sd->last_ddir = io_u->ddir;
	142	sd->queued_bytes += io_u->xfer_buflen;
	143	sd->queued++;
	144	}
	145
	146	static int fio_vsyncio_queue(struct thread_data td, struct io_u io_u)
	147	{
	148	struct syncio_data *sd = td->io_ops->data;
	149
	150	fio_ro_check(td, io_u);
	151
	152	if (!fio_vsyncio_append(td, io_u)) {
	153	dprint(FD_IO, "vsyncio_queue: no append (%d)\n", sd->queued);
	154	/*
	155	* If we can't append and have stuff queued, tell fio to
	156	* commit those first and then retry this io
	157	*/
	158	if (sd->queued)
159	return FIO_Q_BUSY;
cc9159c3 JA	160	if (io_u->ddir == DDIR_SYNC) {
	161	int ret = fsync(io_u->file->fd);
	162
	163	return fio_io_end(td, io_u, ret);
	164	}
1d2af02a JA	165
	166	sd->queued = 0;
	167	sd->queued_bytes = 0;
	168	fio_vsyncio_set_iov(sd, io_u, 0);
	169	} else {
	170	if (sd->queued == td->o.iodepth) {
	171	dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
	172	return FIO_Q_BUSY;
	173	}
	174
	175	dprint(FD_IO, "vsyncio_queue: append\n");
	176	fio_vsyncio_set_iov(sd, io_u, sd->queued);
	177	}
	178
	179	dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
	180	return FIO_Q_QUEUED;
	181	}
	182
	183	/*
	184	* Check that we transferred all bytes, or saw an error, etc
	185	*/
	186	static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
	187	{
	188	struct syncio_data *sd = td->io_ops->data;
	189	struct io_u *io_u;
	190	unsigned int i;
	191	int err;
	192
	193	/*
	194	* transferred everything, perfect
	195	*/
	196	if (bytes == sd->queued_bytes)
	197	return 0;
	198
	199	err = errno;
	200	for (i = 0; i < sd->queued; i++) {
	201	io_u = sd->io_us[i];
	202
	203	if (bytes == -1) {
	204	io_u->error = err;
	205	} else {
	206	unsigned int this_io;
	207
	208	this_io = bytes;
	209	if (this_io > io_u->xfer_buflen)
	210	this_io = io_u->xfer_buflen;
	211
	212	io_u->resid = io_u->xfer_buflen - this_io;
	213	io_u->error = 0;
	214	bytes -= this_io;
	215	}
	216	}
	217
	218	if (bytes == -1) {
	219	td_verror(td, err, "xfer vsync");
	220	return -err;
	221	}
	222
	223	return 0;
	224	}
	225
	226	static int fio_vsyncio_commit(struct thread_data *td)
	227	{
	228	struct syncio_data *sd = td->io_ops->data;
229	struct fio_file *f;
230	ssize_t ret;
231
232	if (!sd->queued)
233	return 0;
234
235	f = sd->last_file;
236
237	if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
238	int err = -errno;
239
240	td_verror(td, errno, "lseek");
241	return err;
242	}
243
244	if (sd->last_ddir == DDIR_READ)
245	ret = readv(f->fd, sd->iovecs, sd->queued);
246	else
247	ret = writev(f->fd, sd->iovecs, sd->queued);
248
249	dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
250	return fio_vsyncio_end(td, ret);
251	}
252
253	static int fio_vsyncio_init(struct thread_data *td)
254	{
255	struct syncio_data *sd;
256
257	sd = malloc(sizeof(*sd));
258	memset(sd, 0, sizeof(*sd));
259	sd->last_offset = -1ULL;
260	sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
261	sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
262
263	td->io_ops->data = sd;
264	return 0;
265	}
266
267	static void fio_vsyncio_cleanup(struct thread_data *td)
268	{
269	struct syncio_data *sd = td->io_ops->data;
270
271	free(sd->iovecs);
272	free(sd->io_us);
273	free(sd);
274	td->io_ops->data = NULL;
275	}
276
a31041ea	277	static struct ioengine_ops ioengine_rw = {
2866c82d JA	278	.name = "sync",
2866c82d JA	279	.version = FIO_IOOPS_VERSION,
2866c82d JA	280	.prep = fio_syncio_prep,
2866c82d JA	281	.queue = fio_syncio_queue,
b5af8293 JA	282	.open_file = generic_open_file,
b5af8293 JA	283	.close_file = generic_close_file,
2866c82d JA	284	.flags = FIO_SYNCIO,
2866c82d JA	285	};
5f350952	286
a31041ea	287	static struct ioengine_ops ioengine_prw = {
	288	.name = "psync",
	289	.version = FIO_IOOPS_VERSION,
2bd3eabc	290	.queue = fio_psyncio_queue,
a31041ea	291	.open_file = generic_open_file,
	292	.close_file = generic_close_file,
	293	.flags = FIO_SYNCIO,
	294	};
	295
1d2af02a JA	296	static struct ioengine_ops ioengine_vrw = {
	297	.name = "vsync",
	298	.version = FIO_IOOPS_VERSION,
	299	.init = fio_vsyncio_init,
	300	.cleanup = fio_vsyncio_cleanup,
	301	.queue = fio_vsyncio_queue,
	302	.commit = fio_vsyncio_commit,
	303	.event = fio_vsyncio_event,
	304	.getevents = fio_vsyncio_getevents,
	305	.open_file = generic_open_file,
	306	.close_file = generic_close_file,
	307	.flags = FIO_SYNCIO,
	308	};
	309
5f350952 JA	310	static void fio_init fio_syncio_register(void)
5f350952 JA	311	{
a31041ea	312	register_ioengine(&ioengine_rw);
a31041ea	313	register_ioengine(&ioengine_prw);
1d2af02a	314	register_ioengine(&ioengine_vrw);
5f350952 JA	315	}
	316
	317	static void fio_exit fio_syncio_unregister(void)
	318	{
a31041ea	319	unregister_ioengine(&ioengine_rw);
a31041ea	320	unregister_ioengine(&ioengine_prw);
1d2af02a	321	unregister_ioengine(&ioengine_vrw);
5f350952	322	}