[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 <sys/uio.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 int events;
	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 (ddir_sync(io_u->ddir))
		return 0;

	if (f->file_pos != -1ULL && f->file_pos == io_u->offset)
		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 (io_u->file && ret >= 0)
		io_u->file->file_pos = io_u->offset + 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 = do_io_u_sync(td, io_u);

	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 = do_io_u_sync(td, io_u);

	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->events;
		sd->events = 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 (ddir_sync(io_u->ddir))
		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 (ddir_sync(io_u->ddir)) {
			int ret = do_io_u_sync(td, io_u);

			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;

	io_u_mark_submit(td, sd->queued);
	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);
	sd->events = sd->queued;
	sd->queued = 0;
	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);
}

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,
	.get_file_size	= generic_get_file_size,
	.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,
	.get_file_size	= generic_get_file_size,
	.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,
	.get_file_size	= generic_get_file_size,
	.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
	1	/*
	2	* sync/psync engine
	3	*
	4	* IO engine that does regular read(2)/write(2) with lseek(2) to transfer
	5	* data and IO engine that does regular pread(2)/pwrite(2) to transfer data.
	6	*
	7	*/
	8	#include <stdio.h>
	9	#include <stdlib.h>
	10	#include <unistd.h>
	11	#include <sys/uio.h>
	12	#include <errno.h>
	13	#include <assert.h>
	14
	15	#include "../fio.h"
	16
	17	struct syncio_data {
	18	struct iovec *iovecs;
	19	struct io_u **io_us;
	20	unsigned int queued;
	21	unsigned int events;
	22	unsigned long queued_bytes;
	23
	24	unsigned long long last_offset;
	25	struct fio_file *last_file;
	26	enum fio_ddir last_ddir;
	27	};
	28
	29	static int fio_syncio_prep(struct thread_data td, struct io_u io_u)
	30	{
	31	struct fio_file *f = io_u->file;
	32
	33	if (ddir_sync(io_u->ddir))
	34	return 0;
	35
	36	if (f->file_pos != -1ULL && f->file_pos == io_u->offset)
	37	return 0;
	38
	39	if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) {
	40	td_verror(td, errno, "lseek");
	41	return 1;
	42	}
	43
	44	return 0;
	45	}
	46
	47	static int fio_io_end(struct thread_data td, struct io_u io_u, int ret)
	48	{
	49	if (io_u->file && ret >= 0)
	50	io_u->file->file_pos = io_u->offset + ret;
	51
	52	if (ret != (int) io_u->xfer_buflen) {
	53	if (ret >= 0) {
	54	io_u->resid = io_u->xfer_buflen - ret;
	55	io_u->error = 0;
	56	return FIO_Q_COMPLETED;
	57	} else
	58	io_u->error = errno;
	59	}
	60
	61	if (io_u->error)
	62	td_verror(td, io_u->error, "xfer");
	63
	64	return FIO_Q_COMPLETED;
	65	}
	66
	67	static int fio_psyncio_queue(struct thread_data td, struct io_u io_u)
	68	{
	69	struct fio_file *f = io_u->file;
	70	int ret;
	71
	72	fio_ro_check(td, io_u);
	73
	74	if (io_u->ddir == DDIR_READ)
	75	ret = pread(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	76	else if (io_u->ddir == DDIR_WRITE)
	77	ret = pwrite(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	78	else
	79	ret = do_io_u_sync(td, io_u);
	80
	81	return fio_io_end(td, io_u, ret);
	82	}
	83
	84	static int fio_syncio_queue(struct thread_data td, struct io_u io_u)
	85	{
	86	struct fio_file *f = io_u->file;
	87	int ret;
	88
	89	fio_ro_check(td, io_u);
	90
	91	if (io_u->ddir == DDIR_READ)
	92	ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
	93	else if (io_u->ddir == DDIR_WRITE)
	94	ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
	95	else
	96	ret = do_io_u_sync(td, io_u);
	97
	98	return fio_io_end(td, io_u, ret);
	99	}
	100
	101	static int fio_vsyncio_getevents(struct thread_data *td, unsigned int min,
	102	unsigned int max,
	103	struct timespec fio_unused *t)
	104	{
	105	struct syncio_data *sd = td->io_ops->data;
	106	int ret;
	107
	108	if (min) {
	109	ret = sd->events;
	110	sd->events = 0;
	111	} else
	112	ret = 0;
	113
	114	dprint(FD_IO, "vsyncio_getevents: min=%d,max=%d: %d\n", min, max, ret);
	115	return ret;
	116	}
	117
	118	static struct io_u fio_vsyncio_event(struct thread_data td, int event)
	119	{
	120	struct syncio_data *sd = td->io_ops->data;
	121
	122	return sd->io_us[event];
	123	}
	124
	125	static int fio_vsyncio_append(struct thread_data td, struct io_u io_u)
	126	{
	127	struct syncio_data *sd = td->io_ops->data;
	128
	129	if (ddir_sync(io_u->ddir))
	130	return 0;
	131
	132	if (io_u->offset == sd->last_offset && io_u->file == sd->last_file &&
	133	io_u->ddir == sd->last_ddir)
	134	return 1;
	135
	136	return 0;
	137	}
	138
	139	static void fio_vsyncio_set_iov(struct syncio_data sd, struct io_u io_u,
	140	int index)
	141	{
	142	sd->io_us[index] = io_u;
	143	sd->iovecs[index].iov_base = io_u->xfer_buf;
	144	sd->iovecs[index].iov_len = io_u->xfer_buflen;
	145	sd->last_offset = io_u->offset + io_u->xfer_buflen;
	146	sd->last_file = io_u->file;
	147	sd->last_ddir = io_u->ddir;
	148	sd->queued_bytes += io_u->xfer_buflen;
	149	sd->queued++;
	150	}
	151
	152	static int fio_vsyncio_queue(struct thread_data td, struct io_u io_u)
	153	{
	154	struct syncio_data *sd = td->io_ops->data;
	155
	156	fio_ro_check(td, io_u);
	157
	158	if (!fio_vsyncio_append(td, io_u)) {
	159	dprint(FD_IO, "vsyncio_queue: no append (%d)\n", sd->queued);
	160	/*
	161	* If we can't append and have stuff queued, tell fio to
	162	* commit those first and then retry this io
	163	*/
	164	if (sd->queued)
	165	return FIO_Q_BUSY;
	166	if (ddir_sync(io_u->ddir)) {
	167	int ret = do_io_u_sync(td, io_u);
	168
	169	return fio_io_end(td, io_u, ret);
	170	}
	171
	172	sd->queued = 0;
	173	sd->queued_bytes = 0;
	174	fio_vsyncio_set_iov(sd, io_u, 0);
	175	} else {
	176	if (sd->queued == td->o.iodepth) {
	177	dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
	178	return FIO_Q_BUSY;
	179	}
	180
	181	dprint(FD_IO, "vsyncio_queue: append\n");
	182	fio_vsyncio_set_iov(sd, io_u, sd->queued);
	183	}
	184
	185	dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
	186	return FIO_Q_QUEUED;
	187	}
	188
	189	/*
	190	* Check that we transferred all bytes, or saw an error, etc
	191	*/
	192	static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
	193	{
	194	struct syncio_data *sd = td->io_ops->data;
	195	struct io_u *io_u;
	196	unsigned int i;
	197	int err;
	198
	199	/*
	200	* transferred everything, perfect
	201	*/
	202	if (bytes == sd->queued_bytes)
	203	return 0;
	204
	205	err = errno;
	206	for (i = 0; i < sd->queued; i++) {
	207	io_u = sd->io_us[i];
	208
	209	if (bytes == -1) {
	210	io_u->error = err;
	211	} else {
	212	unsigned int this_io;
	213
	214	this_io = bytes;
	215	if (this_io > io_u->xfer_buflen)
	216	this_io = io_u->xfer_buflen;
	217
	218	io_u->resid = io_u->xfer_buflen - this_io;
	219	io_u->error = 0;
	220	bytes -= this_io;
	221	}
	222	}
	223
	224	if (bytes == -1) {
	225	td_verror(td, err, "xfer vsync");
	226	return -err;
	227	}
	228
	229	return 0;
	230	}
	231
	232	static int fio_vsyncio_commit(struct thread_data *td)
	233	{
	234	struct syncio_data *sd = td->io_ops->data;
	235	struct fio_file *f;
	236	ssize_t ret;
	237
	238	if (!sd->queued)
	239	return 0;
	240
	241	io_u_mark_submit(td, sd->queued);
	242	f = sd->last_file;
	243
	244	if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
	245	int err = -errno;
	246
	247	td_verror(td, errno, "lseek");
	248	return err;
	249	}
	250
	251	if (sd->last_ddir == DDIR_READ)
	252	ret = readv(f->fd, sd->iovecs, sd->queued);
	253	else
	254	ret = writev(f->fd, sd->iovecs, sd->queued);
	255
	256	dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
	257	sd->events = sd->queued;
	258	sd->queued = 0;
	259	return fio_vsyncio_end(td, ret);
	260	}
	261
	262	static int fio_vsyncio_init(struct thread_data *td)
	263	{
	264	struct syncio_data *sd;
	265
	266	sd = malloc(sizeof(*sd));
	267	memset(sd, 0, sizeof(*sd));
	268	sd->last_offset = -1ULL;
	269	sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
	270	sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
	271
	272	td->io_ops->data = sd;
	273	return 0;
	274	}
	275
	276	static void fio_vsyncio_cleanup(struct thread_data *td)
	277	{
	278	struct syncio_data *sd = td->io_ops->data;
	279
	280	free(sd->iovecs);
	281	free(sd->io_us);
	282	free(sd);
	283	}
	284
	285	static struct ioengine_ops ioengine_rw = {
	286	.name = "sync",
	287	.version = FIO_IOOPS_VERSION,
	288	.prep = fio_syncio_prep,
	289	.queue = fio_syncio_queue,
	290	.open_file = generic_open_file,
	291	.close_file = generic_close_file,
	292	.get_file_size = generic_get_file_size,
	293	.flags = FIO_SYNCIO,
	294	};
	295
	296	static struct ioengine_ops ioengine_prw = {
	297	.name = "psync",
	298	.version = FIO_IOOPS_VERSION,
	299	.queue = fio_psyncio_queue,
	300	.open_file = generic_open_file,
	301	.close_file = generic_close_file,
	302	.get_file_size = generic_get_file_size,
	303	.flags = FIO_SYNCIO,
	304	};
	305
	306	static struct ioengine_ops ioengine_vrw = {
	307	.name = "vsync",
	308	.version = FIO_IOOPS_VERSION,
	309	.init = fio_vsyncio_init,
	310	.cleanup = fio_vsyncio_cleanup,
	311	.queue = fio_vsyncio_queue,
	312	.commit = fio_vsyncio_commit,
	313	.event = fio_vsyncio_event,
	314	.getevents = fio_vsyncio_getevents,
	315	.open_file = generic_open_file,
	316	.close_file = generic_close_file,
	317	.get_file_size = generic_get_file_size,
	318	.flags = FIO_SYNCIO,
	319	};
	320
	321	static void fio_init fio_syncio_register(void)
	322	{
	323	register_ioengine(&ioengine_rw);
	324	register_ioengine(&ioengine_prw);
	325	register_ioengine(&ioengine_vrw);
	326	}
	327
	328	static void fio_exit fio_syncio_unregister(void)
	329	{
	330	unregister_ioengine(&ioengine_rw);
	331	unregister_ioengine(&ioengine_prw);
	332	unregister_ioengine(&ioengine_vrw);
	333	}