[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;

		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;
160
161	sd->queued = 0;
162	sd->queued_bytes = 0;
163	fio_vsyncio_set_iov(sd, io_u, 0);
164	} else {
165	if (sd->queued == td->o.iodepth) {
166	dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
167	return FIO_Q_BUSY;
168	}
169
170	dprint(FD_IO, "vsyncio_queue: append\n");
171	fio_vsyncio_set_iov(sd, io_u, sd->queued);
172	}
173
174	dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
175	return FIO_Q_QUEUED;
176	}
177
178	/*
179	* Check that we transferred all bytes, or saw an error, etc
180	*/
181	static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
182	{
183	struct syncio_data *sd = td->io_ops->data;
184	struct io_u *io_u;
185	unsigned int i;
186	int err;
187
188	/*
189	* transferred everything, perfect
190	*/
191	if (bytes == sd->queued_bytes)
192	return 0;
193
194	err = errno;
195	for (i = 0; i < sd->queued; i++) {
196	io_u = sd->io_us[i];
197
198	if (bytes == -1) {
199	io_u->error = err;
200	} else {
201	unsigned int this_io;
202
203	this_io = bytes;
204	if (this_io > io_u->xfer_buflen)
205	this_io = io_u->xfer_buflen;
206
207	io_u->resid = io_u->xfer_buflen - this_io;
208	io_u->error = 0;
209	bytes -= this_io;
210	}
211	}
212
213	if (bytes == -1) {
214	td_verror(td, err, "xfer vsync");
215	return -err;
216	}
217
218	return 0;
219	}
220
221	static int fio_vsyncio_commit(struct thread_data *td)
222	{
223	struct syncio_data *sd = td->io_ops->data;
224	struct fio_file *f;
225	ssize_t ret;
226
227	if (!sd->queued)
228	return 0;
229
230	f = sd->last_file;
231
232	if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
233	int err = -errno;
234
235	td_verror(td, errno, "lseek");
236	return err;
237	}
238
239	if (sd->last_ddir == DDIR_READ)
240	ret = readv(f->fd, sd->iovecs, sd->queued);
241	else
242	ret = writev(f->fd, sd->iovecs, sd->queued);
243
244	dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
245	return fio_vsyncio_end(td, ret);
246	}
247
248	static int fio_vsyncio_init(struct thread_data *td)
249	{
250	struct syncio_data *sd;
251
252	sd = malloc(sizeof(*sd));
253	memset(sd, 0, sizeof(*sd));
254	sd->last_offset = -1ULL;
255	sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
256	sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
257
258	td->io_ops->data = sd;
259	return 0;
260	}
261
262	static void fio_vsyncio_cleanup(struct thread_data *td)
263	{
264	struct syncio_data *sd = td->io_ops->data;
265
266	free(sd->iovecs);
267	free(sd->io_us);
268	free(sd);
269	td->io_ops->data = NULL;
270	}
271
a31041ea	272	static struct ioengine_ops ioengine_rw = {
2866c82d JA	273	.name = "sync",
2866c82d JA	274	.version = FIO_IOOPS_VERSION,
2866c82d JA	275	.prep = fio_syncio_prep,
2866c82d JA	276	.queue = fio_syncio_queue,
b5af8293 JA	277	.open_file = generic_open_file,
b5af8293 JA	278	.close_file = generic_close_file,
2866c82d JA	279	.flags = FIO_SYNCIO,
2866c82d JA	280	};
5f350952	281
a31041ea	282	static struct ioengine_ops ioengine_prw = {
	283	.name = "psync",
	284	.version = FIO_IOOPS_VERSION,
2bd3eabc	285	.queue = fio_psyncio_queue,
a31041ea	286	.open_file = generic_open_file,
	287	.close_file = generic_close_file,
	288	.flags = FIO_SYNCIO,
	289	};
	290
1d2af02a JA	291	static struct ioengine_ops ioengine_vrw = {
	292	.name = "vsync",
	293	.version = FIO_IOOPS_VERSION,
	294	.init = fio_vsyncio_init,
	295	.cleanup = fio_vsyncio_cleanup,
	296	.queue = fio_vsyncio_queue,
	297	.commit = fio_vsyncio_commit,
	298	.event = fio_vsyncio_event,
	299	.getevents = fio_vsyncio_getevents,
	300	.open_file = generic_open_file,
	301	.close_file = generic_close_file,
	302	.flags = FIO_SYNCIO,
	303	};
	304
5f350952 JA	305	static void fio_init fio_syncio_register(void)
5f350952 JA	306	{
a31041ea	307	register_ioengine(&ioengine_rw);
a31041ea	308	register_ioengine(&ioengine_prw);
1d2af02a	309	register_ioengine(&ioengine_vrw);
5f350952 JA	310	}
	311
	312	static void fio_exit fio_syncio_unregister(void)
	313	{
a31041ea	314	unregister_ioengine(&ioengine_rw);
a31041ea	315	unregister_ioengine(&ioengine_prw);
1d2af02a	316	unregister_ioengine(&ioengine_vrw);
5f350952	317	}