[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"
#include "../optgroup.h"

/*
 * Sync engine uses engine_data to store last offset
 */
#define LAST_POS(f)	((f)->engine_data)

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;
};

#ifdef FIO_HAVE_PWRITEV2
struct psyncv2_options {
	void *pad;
	unsigned int hipri;
};

static struct fio_option options[] = {
	{
		.name	= "hipri",
		.lname	= "RWF_HIPRI",
		.type	= FIO_OPT_STR_SET,
		.off1	= offsetof(struct psyncv2_options, hipri),
		.help	= "Set RWF_HIPRI for pwritev2/preadv2",
		.category = FIO_OPT_C_ENGINE,
		.group	= FIO_OPT_G_INVALID,
	},
	{
		.name	= NULL,
	},
};
#endif

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

	if (!ddir_rw(io_u->ddir))
		return 0;

	if (LAST_POS(f) != -1ULL && LAST_POS(f) == 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 && ddir_rw(io_u->ddir))
		LAST_POS(io_u->file) = 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) {
		io_u_log_error(td, io_u);
		td_verror(td, io_u->error, "xfer");
	}

	return FIO_Q_COMPLETED;
}

#ifdef CONFIG_PWRITEV
static int fio_pvsyncio_queue(struct thread_data *td, struct io_u *io_u)
{
	struct syncio_data *sd = td->io_ops_data;
	struct iovec *iov = &sd->iovecs[0];
	struct fio_file *f = io_u->file;
	int ret;

	fio_ro_check(td, io_u);

	iov->iov_base = io_u->xfer_buf;
	iov->iov_len = io_u->xfer_buflen;

	if (io_u->ddir == DDIR_READ)
		ret = preadv(f->fd, iov, 1, io_u->offset);
	else if (io_u->ddir == DDIR_WRITE)
		ret = pwritev(f->fd, iov, 1, io_u->offset);
	else if (io_u->ddir == DDIR_TRIM) {
		do_io_u_trim(td, io_u);
		return FIO_Q_COMPLETED;
	} else
		ret = do_io_u_sync(td, io_u);

	return fio_io_end(td, io_u, ret);
}
#endif

#ifdef FIO_HAVE_PWRITEV2
static int fio_pvsyncio2_queue(struct thread_data *td, struct io_u *io_u)
{
	struct syncio_data *sd = td->io_ops_data;
	struct psyncv2_options *o = td->eo;
	struct iovec *iov = &sd->iovecs[0];
	struct fio_file *f = io_u->file;
	int ret, flags = 0;

	fio_ro_check(td, io_u);

	if (o->hipri)
		flags |= RWF_HIPRI;

	iov->iov_base = io_u->xfer_buf;
	iov->iov_len = io_u->xfer_buflen;

	if (io_u->ddir == DDIR_READ)
		ret = preadv2(f->fd, iov, 1, io_u->offset, flags);
	else if (io_u->ddir == DDIR_WRITE)
		ret = pwritev2(f->fd, iov, 1, io_u->offset, flags);
	else if (io_u->ddir == DDIR_TRIM) {
		do_io_u_trim(td, io_u);
		return FIO_Q_COMPLETED;
	} else
		ret = do_io_u_sync(td, io_u);

	return fio_io_end(td, io_u, ret);
}
#endif


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 if (io_u->ddir == DDIR_TRIM) {
		do_io_u_trim(td, io_u);
		return FIO_Q_COMPLETED;
	} 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 if (io_u->ddir == DDIR_TRIM) {
		do_io_u_trim(td, io_u);
		return FIO_Q_COMPLETED;
	} 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,
				 const 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 idx)
{
	sd->io_us[idx] = io_u;
	sd->iovecs[idx].iov_base = io_u->xfer_buf;
	sd->iovecs[idx].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;

	if (sd) {
		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,
};

#ifdef CONFIG_PWRITEV
static struct ioengine_ops ioengine_pvrw = {
	.name		= "pvsync",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_vsyncio_init,
	.cleanup	= fio_vsyncio_cleanup,
	.queue		= fio_pvsyncio_queue,
	.open_file	= generic_open_file,
	.close_file	= generic_close_file,
	.get_file_size	= generic_get_file_size,
	.flags		= FIO_SYNCIO,
};
#endif

#ifdef FIO_HAVE_PWRITEV2
static struct ioengine_ops ioengine_pvrw2 = {
	.name		= "pvsync2",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_vsyncio_init,
	.cleanup	= fio_vsyncio_cleanup,
	.queue		= fio_pvsyncio2_queue,
	.open_file	= generic_open_file,
	.close_file	= generic_close_file,
	.get_file_size	= generic_get_file_size,
	.flags		= FIO_SYNCIO,
	.options	= options,
	.option_struct_size	= sizeof(struct psyncv2_options),
};
#endif

static void fio_init fio_syncio_register(void)
{
	register_ioengine(&ioengine_rw);
	register_ioengine(&ioengine_prw);
	register_ioengine(&ioengine_vrw);
#ifdef CONFIG_PWRITEV
	register_ioengine(&ioengine_pvrw);
#endif
#ifdef FIO_HAVE_PWRITEV2
	register_ioengine(&ioengine_pvrw2);
#endif
}

static void fio_exit fio_syncio_unregister(void)
{
	unregister_ioengine(&ioengine_rw);
	unregister_ioengine(&ioengine_prw);
	unregister_ioengine(&ioengine_vrw);
#ifdef CONFIG_PWRITEV
	unregister_ioengine(&ioengine_pvrw);
#endif
#ifdef FIO_HAVE_PWRITEV2
	unregister_ioengine(&ioengine_pvrw2);
#endif
}
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	#include "../optgroup.h"
	17
	18	/*
	19	* Sync engine uses engine_data to store last offset
	20	*/
	21	#define LAST_POS(f) ((f)->engine_data)
	22
	23	struct syncio_data {
	24	struct iovec *iovecs;
	25	struct io_u **io_us;
	26	unsigned int queued;
	27	unsigned int events;
	28	unsigned long queued_bytes;
	29
	30	unsigned long long last_offset;
	31	struct fio_file *last_file;
	32	enum fio_ddir last_ddir;
	33	};
	34
	35	#ifdef FIO_HAVE_PWRITEV2
	36	struct psyncv2_options {
	37	void *pad;
	38	unsigned int hipri;
	39	};
	40
	41	static struct fio_option options[] = {
	42	{
	43	.name = "hipri",
	44	.lname = "RWF_HIPRI",
	45	.type = FIO_OPT_STR_SET,
	46	.off1 = offsetof(struct psyncv2_options, hipri),
	47	.help = "Set RWF_HIPRI for pwritev2/preadv2",
	48	.category = FIO_OPT_C_ENGINE,
	49	.group = FIO_OPT_G_INVALID,
	50	},
	51	{
	52	.name = NULL,
	53	},
	54	};
	55	#endif
	56
	57	static int fio_syncio_prep(struct thread_data td, struct io_u io_u)
	58	{
	59	struct fio_file *f = io_u->file;
	60
	61	if (!ddir_rw(io_u->ddir))
	62	return 0;
	63
	64	if (LAST_POS(f) != -1ULL && LAST_POS(f) == io_u->offset)
	65	return 0;
	66
	67	if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) {
	68	td_verror(td, errno, "lseek");
	69	return 1;
	70	}
	71
	72	return 0;
	73	}
	74
	75	static int fio_io_end(struct thread_data td, struct io_u io_u, int ret)
	76	{
	77	if (io_u->file && ret >= 0 && ddir_rw(io_u->ddir))
	78	LAST_POS(io_u->file) = io_u->offset + ret;
	79
	80	if (ret != (int) io_u->xfer_buflen) {
	81	if (ret >= 0) {
	82	io_u->resid = io_u->xfer_buflen - ret;
	83	io_u->error = 0;
	84	return FIO_Q_COMPLETED;
	85	} else
	86	io_u->error = errno;
	87	}
	88
	89	if (io_u->error) {
	90	io_u_log_error(td, io_u);
	91	td_verror(td, io_u->error, "xfer");
	92	}
	93
	94	return FIO_Q_COMPLETED;
	95	}
	96
	97	#ifdef CONFIG_PWRITEV
	98	static int fio_pvsyncio_queue(struct thread_data td, struct io_u io_u)
	99	{
	100	struct syncio_data *sd = td->io_ops_data;
	101	struct iovec *iov = &sd->iovecs[0];
	102	struct fio_file *f = io_u->file;
	103	int ret;
	104
	105	fio_ro_check(td, io_u);
	106
	107	iov->iov_base = io_u->xfer_buf;
	108	iov->iov_len = io_u->xfer_buflen;
	109
	110	if (io_u->ddir == DDIR_READ)
	111	ret = preadv(f->fd, iov, 1, io_u->offset);
	112	else if (io_u->ddir == DDIR_WRITE)
	113	ret = pwritev(f->fd, iov, 1, io_u->offset);
	114	else if (io_u->ddir == DDIR_TRIM) {
	115	do_io_u_trim(td, io_u);
	116	return FIO_Q_COMPLETED;
	117	} else
	118	ret = do_io_u_sync(td, io_u);
	119
	120	return fio_io_end(td, io_u, ret);
	121	}
	122	#endif
	123
	124	#ifdef FIO_HAVE_PWRITEV2
	125	static int fio_pvsyncio2_queue(struct thread_data td, struct io_u io_u)
	126	{
	127	struct syncio_data *sd = td->io_ops_data;
	128	struct psyncv2_options *o = td->eo;
	129	struct iovec *iov = &sd->iovecs[0];
	130	struct fio_file *f = io_u->file;
	131	int ret, flags = 0;
	132
	133	fio_ro_check(td, io_u);
	134
	135	if (o->hipri)
	136	flags \|= RWF_HIPRI;
	137
	138	iov->iov_base = io_u->xfer_buf;
	139	iov->iov_len = io_u->xfer_buflen;
	140
	141	if (io_u->ddir == DDIR_READ)
	142	ret = preadv2(f->fd, iov, 1, io_u->offset, flags);
	143	else if (io_u->ddir == DDIR_WRITE)
	144	ret = pwritev2(f->fd, iov, 1, io_u->offset, flags);
	145	else if (io_u->ddir == DDIR_TRIM) {
	146	do_io_u_trim(td, io_u);
	147	return FIO_Q_COMPLETED;
	148	} else
	149	ret = do_io_u_sync(td, io_u);
	150
	151	return fio_io_end(td, io_u, ret);
	152	}
	153	#endif
	154
	155
	156	static int fio_psyncio_queue(struct thread_data td, struct io_u io_u)
	157	{
	158	struct fio_file *f = io_u->file;
	159	int ret;
	160
	161	fio_ro_check(td, io_u);
	162
	163	if (io_u->ddir == DDIR_READ)
	164	ret = pread(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	165	else if (io_u->ddir == DDIR_WRITE)
	166	ret = pwrite(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	167	else if (io_u->ddir == DDIR_TRIM) {
	168	do_io_u_trim(td, io_u);
	169	return FIO_Q_COMPLETED;
	170	} else
	171	ret = do_io_u_sync(td, io_u);
	172
	173	return fio_io_end(td, io_u, ret);
	174	}
	175
	176	static int fio_syncio_queue(struct thread_data td, struct io_u io_u)
	177	{
	178	struct fio_file *f = io_u->file;
	179	int ret;
	180
	181	fio_ro_check(td, io_u);
	182
	183	if (io_u->ddir == DDIR_READ)
	184	ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
	185	else if (io_u->ddir == DDIR_WRITE)
	186	ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
	187	else if (io_u->ddir == DDIR_TRIM) {
	188	do_io_u_trim(td, io_u);
	189	return FIO_Q_COMPLETED;
	190	} else
	191	ret = do_io_u_sync(td, io_u);
	192
	193	return fio_io_end(td, io_u, ret);
	194	}
	195
	196	static int fio_vsyncio_getevents(struct thread_data *td, unsigned int min,
	197	unsigned int max,
	198	const struct timespec fio_unused *t)
	199	{
	200	struct syncio_data *sd = td->io_ops_data;
	201	int ret;
	202
	203	if (min) {
	204	ret = sd->events;
	205	sd->events = 0;
	206	} else
	207	ret = 0;
	208
	209	dprint(FD_IO, "vsyncio_getevents: min=%d,max=%d: %d\n", min, max, ret);
	210	return ret;
	211	}
	212
	213	static struct io_u fio_vsyncio_event(struct thread_data td, int event)
	214	{
	215	struct syncio_data *sd = td->io_ops_data;
	216
	217	return sd->io_us[event];
	218	}
	219
	220	static int fio_vsyncio_append(struct thread_data td, struct io_u io_u)
	221	{
	222	struct syncio_data *sd = td->io_ops_data;
	223
	224	if (ddir_sync(io_u->ddir))
	225	return 0;
	226
	227	if (io_u->offset == sd->last_offset && io_u->file == sd->last_file &&
	228	io_u->ddir == sd->last_ddir)
	229	return 1;
	230
	231	return 0;
	232	}
	233
	234	static void fio_vsyncio_set_iov(struct syncio_data sd, struct io_u io_u,
	235	int idx)
	236	{
	237	sd->io_us[idx] = io_u;
	238	sd->iovecs[idx].iov_base = io_u->xfer_buf;
	239	sd->iovecs[idx].iov_len = io_u->xfer_buflen;
	240	sd->last_offset = io_u->offset + io_u->xfer_buflen;
	241	sd->last_file = io_u->file;
	242	sd->last_ddir = io_u->ddir;
	243	sd->queued_bytes += io_u->xfer_buflen;
	244	sd->queued++;
	245	}
	246
	247	static int fio_vsyncio_queue(struct thread_data td, struct io_u io_u)
	248	{
	249	struct syncio_data *sd = td->io_ops_data;
	250
	251	fio_ro_check(td, io_u);
	252
	253	if (!fio_vsyncio_append(td, io_u)) {
	254	dprint(FD_IO, "vsyncio_queue: no append (%d)\n", sd->queued);
	255	/*
	256	* If we can't append and have stuff queued, tell fio to
	257	* commit those first and then retry this io
	258	*/
	259	if (sd->queued)
	260	return FIO_Q_BUSY;
	261	if (ddir_sync(io_u->ddir)) {
	262	int ret = do_io_u_sync(td, io_u);
	263
	264	return fio_io_end(td, io_u, ret);
	265	}
	266
	267	sd->queued = 0;
	268	sd->queued_bytes = 0;
	269	fio_vsyncio_set_iov(sd, io_u, 0);
	270	} else {
	271	if (sd->queued == td->o.iodepth) {
	272	dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
	273	return FIO_Q_BUSY;
	274	}
	275
	276	dprint(FD_IO, "vsyncio_queue: append\n");
	277	fio_vsyncio_set_iov(sd, io_u, sd->queued);
	278	}
	279
	280	dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
	281	return FIO_Q_QUEUED;
	282	}
	283
	284	/*
	285	* Check that we transferred all bytes, or saw an error, etc
	286	*/
	287	static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
	288	{
	289	struct syncio_data *sd = td->io_ops_data;
	290	struct io_u *io_u;
	291	unsigned int i;
	292	int err;
	293
	294	/*
	295	* transferred everything, perfect
	296	*/
	297	if (bytes == sd->queued_bytes)
	298	return 0;
	299
	300	err = errno;
	301	for (i = 0; i < sd->queued; i++) {
	302	io_u = sd->io_us[i];
	303
	304	if (bytes == -1) {
	305	io_u->error = err;
	306	} else {
	307	unsigned int this_io;
	308
	309	this_io = bytes;
	310	if (this_io > io_u->xfer_buflen)
	311	this_io = io_u->xfer_buflen;
	312
	313	io_u->resid = io_u->xfer_buflen - this_io;
	314	io_u->error = 0;
	315	bytes -= this_io;
	316	}
	317	}
	318
	319	if (bytes == -1) {
	320	td_verror(td, err, "xfer vsync");
	321	return -err;
	322	}
	323
	324	return 0;
	325	}
	326
	327	static int fio_vsyncio_commit(struct thread_data *td)
	328	{
	329	struct syncio_data *sd = td->io_ops_data;
	330	struct fio_file *f;
	331	ssize_t ret;
	332
	333	if (!sd->queued)
	334	return 0;
	335
	336	io_u_mark_submit(td, sd->queued);
	337	f = sd->last_file;
	338
	339	if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
	340	int err = -errno;
	341
	342	td_verror(td, errno, "lseek");
	343	return err;
	344	}
	345
	346	if (sd->last_ddir == DDIR_READ)
	347	ret = readv(f->fd, sd->iovecs, sd->queued);
	348	else
	349	ret = writev(f->fd, sd->iovecs, sd->queued);
	350
	351	dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
	352	sd->events = sd->queued;
	353	sd->queued = 0;
	354	return fio_vsyncio_end(td, ret);
	355	}
	356
	357	static int fio_vsyncio_init(struct thread_data *td)
	358	{
	359	struct syncio_data *sd;
	360
	361	sd = malloc(sizeof(*sd));
	362	memset(sd, 0, sizeof(*sd));
	363	sd->last_offset = -1ULL;
	364	sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
	365	sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
	366
	367	td->io_ops_data = sd;
	368	return 0;
	369	}
	370
	371	static void fio_vsyncio_cleanup(struct thread_data *td)
	372	{
	373	struct syncio_data *sd = td->io_ops_data;
	374
	375	if (sd) {
	376	free(sd->iovecs);
	377	free(sd->io_us);
	378	free(sd);
	379	}
	380	}
	381
	382	static struct ioengine_ops ioengine_rw = {
	383	.name = "sync",
	384	.version = FIO_IOOPS_VERSION,
	385	.prep = fio_syncio_prep,
	386	.queue = fio_syncio_queue,
	387	.open_file = generic_open_file,
	388	.close_file = generic_close_file,
	389	.get_file_size = generic_get_file_size,
	390	.flags = FIO_SYNCIO,
	391	};
	392
	393	static struct ioengine_ops ioengine_prw = {
	394	.name = "psync",
	395	.version = FIO_IOOPS_VERSION,
	396	.queue = fio_psyncio_queue,
	397	.open_file = generic_open_file,
	398	.close_file = generic_close_file,
	399	.get_file_size = generic_get_file_size,
	400	.flags = FIO_SYNCIO,
	401	};
	402
	403	static struct ioengine_ops ioengine_vrw = {
	404	.name = "vsync",
	405	.version = FIO_IOOPS_VERSION,
	406	.init = fio_vsyncio_init,
	407	.cleanup = fio_vsyncio_cleanup,
	408	.queue = fio_vsyncio_queue,
	409	.commit = fio_vsyncio_commit,
	410	.event = fio_vsyncio_event,
	411	.getevents = fio_vsyncio_getevents,
	412	.open_file = generic_open_file,
	413	.close_file = generic_close_file,
	414	.get_file_size = generic_get_file_size,
	415	.flags = FIO_SYNCIO,
	416	};
	417
	418	#ifdef CONFIG_PWRITEV
	419	static struct ioengine_ops ioengine_pvrw = {
	420	.name = "pvsync",
	421	.version = FIO_IOOPS_VERSION,
	422	.init = fio_vsyncio_init,
	423	.cleanup = fio_vsyncio_cleanup,
	424	.queue = fio_pvsyncio_queue,
	425	.open_file = generic_open_file,
	426	.close_file = generic_close_file,
	427	.get_file_size = generic_get_file_size,
	428	.flags = FIO_SYNCIO,
	429	};
	430	#endif
	431
	432	#ifdef FIO_HAVE_PWRITEV2
	433	static struct ioengine_ops ioengine_pvrw2 = {
	434	.name = "pvsync2",
	435	.version = FIO_IOOPS_VERSION,
	436	.init = fio_vsyncio_init,
	437	.cleanup = fio_vsyncio_cleanup,
	438	.queue = fio_pvsyncio2_queue,
	439	.open_file = generic_open_file,
	440	.close_file = generic_close_file,
	441	.get_file_size = generic_get_file_size,
	442	.flags = FIO_SYNCIO,
	443	.options = options,
	444	.option_struct_size = sizeof(struct psyncv2_options),
	445	};
	446	#endif
	447
	448	static void fio_init fio_syncio_register(void)
	449	{
	450	register_ioengine(&ioengine_rw);
	451	register_ioengine(&ioengine_prw);
	452	register_ioengine(&ioengine_vrw);
	453	#ifdef CONFIG_PWRITEV
	454	register_ioengine(&ioengine_pvrw);
	455	#endif
	456	#ifdef FIO_HAVE_PWRITEV2
	457	register_ioengine(&ioengine_pvrw2);
	458	#endif
	459	}
	460
	461	static void fio_exit fio_syncio_unregister(void)
	462	{
	463	unregister_ioengine(&ioengine_rw);
	464	unregister_ioengine(&ioengine_prw);
	465	unregister_ioengine(&ioengine_vrw);
	466	#ifdef CONFIG_PWRITEV
	467	unregister_ioengine(&ioengine_pvrw);
	468	#endif
	469	#ifdef FIO_HAVE_PWRITEV2
	470	unregister_ioengine(&ioengine_pvrw2);
	471	#endif
	472	}