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