[fio.git] / engines / sg.c

/*
 * sg engine
 *
 * IO engine that uses the Linux SG v3 interface to talk to SCSI devices
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <sys/poll.h>

#include "../fio.h"
#include "../os.h"

#ifdef FIO_HAVE_SGIO

struct sgio_cmd {
	unsigned char cdb[10];
	int nr;
};

struct sgio_data {
	struct sgio_cmd *cmds;
	struct io_u **events;
	struct pollfd *pfds;
	int *fd_flags;
	void *sgbuf;
	unsigned int bs;
	int type_checked;
};

static void sgio_hdr_init(struct sgio_data *sd, struct sg_io_hdr *hdr,
			  struct io_u *io_u, int fs)
{
	struct sgio_cmd *sc = &sd->cmds[io_u->index];

	memset(hdr, 0, sizeof(*hdr));
	memset(sc->cdb, 0, sizeof(sc->cdb));

	hdr->interface_id = 'S';
	hdr->cmdp = sc->cdb;
	hdr->cmd_len = sizeof(sc->cdb);
	hdr->pack_id = io_u->index;
	hdr->usr_ptr = io_u;

	if (fs) {
		hdr->dxferp = io_u->xfer_buf;
		hdr->dxfer_len = io_u->xfer_buflen;
	}
}

static int pollin_events(struct pollfd *pfds, int fds)
{
	int i;

	for (i = 0; i < fds; i++)
		if (pfds[i].revents & POLLIN)
			return 1;

	return 0;
}

static int fio_sgio_getevents(struct thread_data *td, int min, int max,
			      struct timespec fio_unused *t)
{
	/*
	 * normally hard coding &td->files[0] is a bug that needs to be fixed,
	 * but it's ok here as all files should point to the same device.
	 */
	struct fio_file *f = &td->files[0];
	struct sgio_data *sd = td->io_ops->data;
	int left = max, ret, r = 0;
	void *buf = sd->sgbuf;
	unsigned int i, events;

	/*
	 * Fill in the file descriptors
	 */
	for_each_file(td, f, i) {
		/*
		 * don't block for min events == 0
		 */
		if (!min) {
			sd->fd_flags[i] = fcntl(f->fd, F_GETFL);
			fcntl(f->fd, F_SETFL, sd->fd_flags[i] | O_NONBLOCK);
		}
		sd->pfds[i].fd = f->fd;
		sd->pfds[i].events = POLLIN;
	}

	while (left) {
		void *p;

		do {
			if (!min)
				break;

			ret = poll(sd->pfds, td->o.nr_files, -1);
			if (ret < 0) {
				if (!r)
					r = -errno;
				td_verror(td, errno, "poll");
				break;
			} else if (!ret)
				continue;

			if (pollin_events(sd->pfds, td->o.nr_files))
				break;
		} while (1);

		if (r < 0)
			break;

re_read:
		p = buf;
		events = 0;
		for_each_file(td, f, i) {
			ret = read(f->fd, p, left * sizeof(struct sg_io_hdr));
			if (ret < 0) {
				if (errno == EAGAIN)
					continue;
				r = -errno;
				td_verror(td, errno, "read");
				break;
			} else if (ret) {
				p += ret;
				events += ret / sizeof(struct sg_io_hdr);
			}
		}

		if (r < 0)
			break;
		if (!events) {
			usleep(1000);
			goto re_read;
		}

		left -= events;
		r += events;

		for (i = 0; i < events; i++) {
			struct sg_io_hdr *hdr = (struct sg_io_hdr *) buf + i;

			sd->events[i] = hdr->usr_ptr;
		}
	}

	if (!min) {
		for_each_file(td, f, i)
			fcntl(f->fd, F_SETFL, sd->fd_flags[i]);
	}

	return r;
}

static int fio_sgio_ioctl_doio(struct thread_data *td,
			       struct fio_file *f, struct io_u *io_u)
{
	struct sgio_data *sd = td->io_ops->data;
	struct sg_io_hdr *hdr = &io_u->hdr;
	int ret;

	sd->events[0] = io_u;

	ret = ioctl(f->fd, SG_IO, hdr);
	if (ret < 0)
		return -errno;

	return FIO_Q_COMPLETED;
}

static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int sync)
{
	struct sg_io_hdr *hdr = &io_u->hdr;
	int ret;

	ret = write(f->fd, hdr, sizeof(*hdr));
	if (ret < 0)
		return errno;

	if (sync) {
		ret = read(f->fd, hdr, sizeof(*hdr));
		if (ret < 0)
			return -errno;
		return FIO_Q_COMPLETED;
	}

	return FIO_Q_QUEUED;
}

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

	if (f->filetype == FIO_TYPE_BD)
		return fio_sgio_ioctl_doio(td, f, io_u);

	return fio_sgio_rw_doio(f, io_u, sync);
}

static int fio_sgio_prep(struct thread_data *td, struct io_u *io_u)
{
	struct sg_io_hdr *hdr = &io_u->hdr;
	struct sgio_data *sd = td->io_ops->data;
	int nr_blocks, lba;

	if (io_u->xfer_buflen & (sd->bs - 1)) {
		log_err("read/write not sector aligned\n");
		return EINVAL;
	}

	if (io_u->ddir == DDIR_READ) {
		sgio_hdr_init(sd, hdr, io_u, 1);

		hdr->dxfer_direction = SG_DXFER_FROM_DEV;
		hdr->cmdp[0] = 0x28;
	} else if (io_u->ddir == DDIR_WRITE) {
		sgio_hdr_init(sd, hdr, io_u, 1);

		hdr->dxfer_direction = SG_DXFER_TO_DEV;
		hdr->cmdp[0] = 0x2a;
	} else {
		sgio_hdr_init(sd, hdr, io_u, 0);

		hdr->dxfer_direction = SG_DXFER_NONE;
		hdr->cmdp[0] = 0x35;
	}

	if (hdr->dxfer_direction != SG_DXFER_NONE) {
		nr_blocks = io_u->xfer_buflen / sd->bs;
		lba = io_u->offset / sd->bs;
		hdr->cmdp[2] = (unsigned char) ((lba >> 24) & 0xff);
		hdr->cmdp[3] = (unsigned char) ((lba >> 16) & 0xff);
		hdr->cmdp[4] = (unsigned char) ((lba >>  8) & 0xff);
		hdr->cmdp[5] = (unsigned char) (lba & 0xff);
		hdr->cmdp[7] = (unsigned char) ((nr_blocks >> 8) & 0xff);
		hdr->cmdp[8] = (unsigned char) (nr_blocks & 0xff);
	}

	return 0;
}

static int fio_sgio_queue(struct thread_data *td, struct io_u *io_u)
{
	struct sg_io_hdr *hdr = &io_u->hdr;
	int ret;

	ret = fio_sgio_doio(td, io_u, io_u->ddir == DDIR_SYNC);

	if (ret < 0)
		io_u->error = errno;
	else if (hdr->status) {
		io_u->resid = hdr->resid;
		io_u->error = EIO;
	}

	if (io_u->error) {
		td_verror(td, io_u->error, "xfer");
		return FIO_Q_COMPLETED;
	}

	return ret;
}

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

	return sd->events[event];
}

static int fio_sgio_get_bs(struct thread_data *td, unsigned int *bs)
{
	struct sgio_data *sd = td->io_ops->data;
	struct io_u *io_u;
	struct sg_io_hdr *hdr;
	unsigned char buf[8];
	int ret;

	io_u = __get_io_u(td);
	io_u->file = &td->files[0];
	assert(io_u);

	hdr = &io_u->hdr;
	sgio_hdr_init(sd, hdr, io_u, 0);
	memset(buf, 0, sizeof(buf));

	hdr->cmdp[0] = 0x25;
	hdr->dxfer_direction = SG_DXFER_FROM_DEV;
	hdr->dxferp = buf;
	hdr->dxfer_len = sizeof(buf);

	ret = fio_sgio_doio(td, io_u, 1);
	if (ret) {
		put_io_u(td, io_u);
		return ret;
	}

	*bs = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7];
	put_io_u(td, io_u);
	return 0;
}

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

	if (sd) {
		free(sd->events);
		free(sd->cmds);
		free(sd->fd_flags);
		free(sd->pfds);
		free(sd->sgbuf);
		free(sd);

		td->io_ops->data = NULL;
	}
}

static int fio_sgio_init(struct thread_data *td)
{
	struct sgio_data *sd;

	sd = malloc(sizeof(*sd));
	memset(sd, 0, sizeof(*sd));
	sd->cmds = malloc(td->o.iodepth * sizeof(struct sgio_cmd));
	memset(sd->cmds, 0, td->o.iodepth * sizeof(struct sgio_cmd));
	sd->events = malloc(td->o.iodepth * sizeof(struct io_u *));
	memset(sd->events, 0, td->o.iodepth * sizeof(struct io_u *));
	sd->pfds = malloc(sizeof(struct pollfd) * td->o.nr_files);
	memset(sd->pfds, 0, sizeof(struct pollfd) * td->o.nr_files);
	sd->fd_flags = malloc(sizeof(int) * td->o.nr_files);
	memset(sd->fd_flags, 0, sizeof(int) * td->o.nr_files);
	sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->o.iodepth);
	memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->o.iodepth);

	td->io_ops->data = sd;

	/*
	 * we want to do it, regardless of whether odirect is set or not
	 */
	td->o.override_sync = 1;
	return 0;
}

static int fio_sgio_type_check(struct thread_data *td, struct fio_file *f)
{
	struct sgio_data *sd = td->io_ops->data;
	unsigned int bs;

	if (f->filetype == FIO_TYPE_BD) {
		if (ioctl(f->fd, BLKSSZGET, &bs) < 0) {
			td_verror(td, errno, "ioctl");
			return 1;
		}
	} else if (f->filetype == FIO_TYPE_CHAR) {
		int version, ret;

		if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) {
			td_verror(td, errno, "ioctl");
			return 1;
		}

		ret = fio_sgio_get_bs(td, &bs);
		if (ret)
			return 1;
	} else {
		log_err("ioengine sgio only works on block devices\n");
		return 1;
	}

	sd->bs = bs;

	if (f->filetype == FIO_TYPE_BD) {
		td->io_ops->getevents = NULL;
		td->io_ops->event = NULL;
	}

	return 0;
}

static int fio_sgio_open(struct thread_data *td, struct fio_file *f)
{
	struct sgio_data *sd = td->io_ops->data;
	int ret;

	ret = generic_open_file(td, f);
	if (ret)
		return ret;

	if (!sd->type_checked && fio_sgio_type_check(td, f)) {
		generic_close_file(td, f);
		return 1;
	}

	return 0;
}

static struct ioengine_ops ioengine = {
	.name		= "sg",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_sgio_init,
	.prep		= fio_sgio_prep,
	.queue		= fio_sgio_queue,
	.getevents	= fio_sgio_getevents,
	.event		= fio_sgio_event,
	.cleanup	= fio_sgio_cleanup,
	.open_file	= fio_sgio_open,
	.close_file	= generic_close_file,
	.flags		= FIO_SYNCIO | FIO_RAWIO,
};

#else /* FIO_HAVE_SGIO */

/*
 * When we have a proper configure system in place, we simply wont build
 * and install this io engine. For now install a crippled version that
 * just complains and fails to load.
 */
static int fio_sgio_init(struct thread_data fio_unused *td)
{
	fprintf(stderr, "fio: sgio not available\n");
	return 1;
}

static struct ioengine_ops ioengine = {
	.name		= "sgio",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_sgio_init,
};

#endif

static void fio_init fio_sgio_register(void)
{
	register_ioengine(&ioengine);
}

static void fio_exit fio_sgio_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
	1	/*
	2	* sg engine
	3	*
	4	* IO engine that uses the Linux SG v3 interface to talk to SCSI devices
	5	*
	6	*/
	7	#include <stdio.h>
	8	#include <stdlib.h>
	9	#include <unistd.h>
	10	#include <errno.h>
	11	#include <assert.h>
	12	#include <sys/poll.h>
	13
	14	#include "../fio.h"
	15	#include "../os.h"
	16
	17	#ifdef FIO_HAVE_SGIO
	18
	19	struct sgio_cmd {
	20	unsigned char cdb[10];
	21	int nr;
	22	};
	23
	24	struct sgio_data {
	25	struct sgio_cmd *cmds;
	26	struct io_u **events;
	27	struct pollfd *pfds;
	28	int *fd_flags;
	29	void *sgbuf;
	30	unsigned int bs;
	31	int type_checked;
	32	};
	33
	34	static void sgio_hdr_init(struct sgio_data sd, struct sg_io_hdr hdr,
	35	struct io_u *io_u, int fs)
	36	{
	37	struct sgio_cmd *sc = &sd->cmds[io_u->index];
	38
	39	memset(hdr, 0, sizeof(*hdr));
	40	memset(sc->cdb, 0, sizeof(sc->cdb));
	41
	42	hdr->interface_id = 'S';
	43	hdr->cmdp = sc->cdb;
	44	hdr->cmd_len = sizeof(sc->cdb);
	45	hdr->pack_id = io_u->index;
	46	hdr->usr_ptr = io_u;
	47
	48	if (fs) {
	49	hdr->dxferp = io_u->xfer_buf;
	50	hdr->dxfer_len = io_u->xfer_buflen;
	51	}
	52	}
	53
	54	static int pollin_events(struct pollfd *pfds, int fds)
	55	{
	56	int i;
	57
	58	for (i = 0; i < fds; i++)
	59	if (pfds[i].revents & POLLIN)
	60	return 1;
	61
	62	return 0;
	63	}
	64
	65	static int fio_sgio_getevents(struct thread_data *td, int min, int max,
	66	struct timespec fio_unused *t)
	67	{
	68	/*
	69	* normally hard coding &td->files[0] is a bug that needs to be fixed,
	70	* but it's ok here as all files should point to the same device.
	71	*/
	72	struct fio_file *f = &td->files[0];
	73	struct sgio_data *sd = td->io_ops->data;
	74	int left = max, ret, r = 0;
	75	void *buf = sd->sgbuf;
	76	unsigned int i, events;
	77
	78	/*
	79	* Fill in the file descriptors
	80	*/
	81	for_each_file(td, f, i) {
	82	/*
	83	* don't block for min events == 0
	84	*/
	85	if (!min) {
	86	sd->fd_flags[i] = fcntl(f->fd, F_GETFL);
	87	fcntl(f->fd, F_SETFL, sd->fd_flags[i] \| O_NONBLOCK);
	88	}
	89	sd->pfds[i].fd = f->fd;
	90	sd->pfds[i].events = POLLIN;
	91	}
	92
	93	while (left) {
	94	void *p;
	95
	96	do {
	97	if (!min)
	98	break;
	99
	100	ret = poll(sd->pfds, td->o.nr_files, -1);
	101	if (ret < 0) {
	102	if (!r)
	103	r = -errno;
	104	td_verror(td, errno, "poll");
	105	break;
	106	} else if (!ret)
	107	continue;
	108
	109	if (pollin_events(sd->pfds, td->o.nr_files))
	110	break;
	111	} while (1);
	112
	113	if (r < 0)
	114	break;
	115
	116	re_read:
	117	p = buf;
	118	events = 0;
	119	for_each_file(td, f, i) {
	120	ret = read(f->fd, p, left * sizeof(struct sg_io_hdr));
	121	if (ret < 0) {
	122	if (errno == EAGAIN)
	123	continue;
	124	r = -errno;
	125	td_verror(td, errno, "read");
	126	break;
	127	} else if (ret) {
	128	p += ret;
	129	events += ret / sizeof(struct sg_io_hdr);
	130	}
	131	}
	132
	133	if (r < 0)
	134	break;
	135	if (!events) {
	136	usleep(1000);
	137	goto re_read;
	138	}
	139
	140	left -= events;
	141	r += events;
	142
	143	for (i = 0; i < events; i++) {
	144	struct sg_io_hdr hdr = (struct sg_io_hdr ) buf + i;
	145
	146	sd->events[i] = hdr->usr_ptr;
	147	}
	148	}
	149
	150	if (!min) {
	151	for_each_file(td, f, i)
	152	fcntl(f->fd, F_SETFL, sd->fd_flags[i]);
	153	}
	154
	155	return r;
	156	}
	157
	158	static int fio_sgio_ioctl_doio(struct thread_data *td,
	159	struct fio_file f, struct io_u io_u)
	160	{
	161	struct sgio_data *sd = td->io_ops->data;
	162	struct sg_io_hdr *hdr = &io_u->hdr;
	163	int ret;
	164
	165	sd->events[0] = io_u;
	166
	167	ret = ioctl(f->fd, SG_IO, hdr);
	168	if (ret < 0)
	169	return -errno;
	170
	171	return FIO_Q_COMPLETED;
	172	}
	173
	174	static int fio_sgio_rw_doio(struct fio_file f, struct io_u io_u, int sync)
	175	{
	176	struct sg_io_hdr *hdr = &io_u->hdr;
	177	int ret;
	178
	179	ret = write(f->fd, hdr, sizeof(*hdr));
	180	if (ret < 0)
	181	return errno;
	182
	183	if (sync) {
	184	ret = read(f->fd, hdr, sizeof(*hdr));
	185	if (ret < 0)
	186	return -errno;
	187	return FIO_Q_COMPLETED;
	188	}
	189
	190	return FIO_Q_QUEUED;
	191	}
	192
	193	static int fio_sgio_doio(struct thread_data td, struct io_u io_u, int sync)
	194	{
	195	struct fio_file *f = io_u->file;
	196
	197	if (f->filetype == FIO_TYPE_BD)
	198	return fio_sgio_ioctl_doio(td, f, io_u);
	199
	200	return fio_sgio_rw_doio(f, io_u, sync);
	201	}
	202
	203	static int fio_sgio_prep(struct thread_data td, struct io_u io_u)
	204	{
	205	struct sg_io_hdr *hdr = &io_u->hdr;
	206	struct sgio_data *sd = td->io_ops->data;
	207	int nr_blocks, lba;
	208
	209	if (io_u->xfer_buflen & (sd->bs - 1)) {
	210	log_err("read/write not sector aligned\n");
	211	return EINVAL;
	212	}
	213
	214	if (io_u->ddir == DDIR_READ) {
	215	sgio_hdr_init(sd, hdr, io_u, 1);
	216
	217	hdr->dxfer_direction = SG_DXFER_FROM_DEV;
	218	hdr->cmdp[0] = 0x28;
	219	} else if (io_u->ddir == DDIR_WRITE) {
	220	sgio_hdr_init(sd, hdr, io_u, 1);
	221
	222	hdr->dxfer_direction = SG_DXFER_TO_DEV;
	223	hdr->cmdp[0] = 0x2a;
	224	} else {
	225	sgio_hdr_init(sd, hdr, io_u, 0);
	226
	227	hdr->dxfer_direction = SG_DXFER_NONE;
	228	hdr->cmdp[0] = 0x35;
	229	}
	230
	231	if (hdr->dxfer_direction != SG_DXFER_NONE) {
	232	nr_blocks = io_u->xfer_buflen / sd->bs;
	233	lba = io_u->offset / sd->bs;
	234	hdr->cmdp[2] = (unsigned char) ((lba >> 24) & 0xff);
	235	hdr->cmdp[3] = (unsigned char) ((lba >> 16) & 0xff);
	236	hdr->cmdp[4] = (unsigned char) ((lba >> 8) & 0xff);
	237	hdr->cmdp[5] = (unsigned char) (lba & 0xff);
	238	hdr->cmdp[7] = (unsigned char) ((nr_blocks >> 8) & 0xff);
	239	hdr->cmdp[8] = (unsigned char) (nr_blocks & 0xff);
	240	}
	241
	242	return 0;
	243	}
	244
	245	static int fio_sgio_queue(struct thread_data td, struct io_u io_u)
	246	{
	247	struct sg_io_hdr *hdr = &io_u->hdr;
	248	int ret;
	249
	250	ret = fio_sgio_doio(td, io_u, io_u->ddir == DDIR_SYNC);
	251
	252	if (ret < 0)
	253	io_u->error = errno;
	254	else if (hdr->status) {
	255	io_u->resid = hdr->resid;
	256	io_u->error = EIO;
	257	}
	258
	259	if (io_u->error) {
	260	td_verror(td, io_u->error, "xfer");
	261	return FIO_Q_COMPLETED;
	262	}
	263
	264	return ret;
	265	}
	266
	267	static struct io_u fio_sgio_event(struct thread_data td, int event)
	268	{
	269	struct sgio_data *sd = td->io_ops->data;
	270
	271	return sd->events[event];
	272	}
	273
	274	static int fio_sgio_get_bs(struct thread_data td, unsigned int bs)
	275	{
	276	struct sgio_data *sd = td->io_ops->data;
	277	struct io_u *io_u;
	278	struct sg_io_hdr *hdr;
	279	unsigned char buf[8];
	280	int ret;
	281
	282	io_u = __get_io_u(td);
	283	io_u->file = &td->files[0];
	284	assert(io_u);
	285
	286	hdr = &io_u->hdr;
	287	sgio_hdr_init(sd, hdr, io_u, 0);
	288	memset(buf, 0, sizeof(buf));
	289
	290	hdr->cmdp[0] = 0x25;
	291	hdr->dxfer_direction = SG_DXFER_FROM_DEV;
	292	hdr->dxferp = buf;
	293	hdr->dxfer_len = sizeof(buf);
	294
	295	ret = fio_sgio_doio(td, io_u, 1);
	296	if (ret) {
	297	put_io_u(td, io_u);
	298	return ret;
	299	}
	300
	301	*bs = (buf[4] << 24) \| (buf[5] << 16) \| (buf[6] << 8) \| buf[7];
	302	put_io_u(td, io_u);
	303	return 0;
	304	}
	305
	306	static void fio_sgio_cleanup(struct thread_data *td)
	307	{
	308	struct sgio_data *sd = td->io_ops->data;
	309
	310	if (sd) {
	311	free(sd->events);
	312	free(sd->cmds);
	313	free(sd->fd_flags);
	314	free(sd->pfds);
	315	free(sd->sgbuf);
	316	free(sd);
	317
	318	td->io_ops->data = NULL;
	319	}
	320	}
	321
	322	static int fio_sgio_init(struct thread_data *td)
	323	{
	324	struct sgio_data *sd;
	325
	326	sd = malloc(sizeof(*sd));
	327	memset(sd, 0, sizeof(*sd));
	328	sd->cmds = malloc(td->o.iodepth * sizeof(struct sgio_cmd));
	329	memset(sd->cmds, 0, td->o.iodepth * sizeof(struct sgio_cmd));
	330	sd->events = malloc(td->o.iodepth * sizeof(struct io_u *));
	331	memset(sd->events, 0, td->o.iodepth * sizeof(struct io_u *));
	332	sd->pfds = malloc(sizeof(struct pollfd) * td->o.nr_files);
	333	memset(sd->pfds, 0, sizeof(struct pollfd) * td->o.nr_files);
	334	sd->fd_flags = malloc(sizeof(int) * td->o.nr_files);
	335	memset(sd->fd_flags, 0, sizeof(int) * td->o.nr_files);
	336	sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->o.iodepth);
	337	memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->o.iodepth);
	338
	339	td->io_ops->data = sd;
	340
	341	/*
	342	* we want to do it, regardless of whether odirect is set or not
	343	*/
	344	td->o.override_sync = 1;
	345	return 0;
	346	}
	347
	348	static int fio_sgio_type_check(struct thread_data td, struct fio_file f)
	349	{
	350	struct sgio_data *sd = td->io_ops->data;
	351	unsigned int bs;
	352
	353	if (f->filetype == FIO_TYPE_BD) {
	354	if (ioctl(f->fd, BLKSSZGET, &bs) < 0) {
	355	td_verror(td, errno, "ioctl");
	356	return 1;
	357	}
	358	} else if (f->filetype == FIO_TYPE_CHAR) {
	359	int version, ret;
	360
	361	if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) {
	362	td_verror(td, errno, "ioctl");
	363	return 1;
	364	}
	365
	366	ret = fio_sgio_get_bs(td, &bs);
	367	if (ret)
	368	return 1;
	369	} else {
	370	log_err("ioengine sgio only works on block devices\n");
	371	return 1;
	372	}
	373
	374	sd->bs = bs;
	375
	376	if (f->filetype == FIO_TYPE_BD) {
	377	td->io_ops->getevents = NULL;
	378	td->io_ops->event = NULL;
	379	}
	380
	381	return 0;
	382	}
	383
	384	static int fio_sgio_open(struct thread_data td, struct fio_file f)
	385	{
	386	struct sgio_data *sd = td->io_ops->data;
	387	int ret;
	388
	389	ret = generic_open_file(td, f);
	390	if (ret)
	391	return ret;
	392
	393	if (!sd->type_checked && fio_sgio_type_check(td, f)) {
	394	generic_close_file(td, f);
	395	return 1;
	396	}
	397
	398	return 0;
	399	}
	400
	401	static struct ioengine_ops ioengine = {
	402	.name = "sg",
	403	.version = FIO_IOOPS_VERSION,
	404	.init = fio_sgio_init,
	405	.prep = fio_sgio_prep,
	406	.queue = fio_sgio_queue,
	407	.getevents = fio_sgio_getevents,
	408	.event = fio_sgio_event,
	409	.cleanup = fio_sgio_cleanup,
	410	.open_file = fio_sgio_open,
	411	.close_file = generic_close_file,
	412	.flags = FIO_SYNCIO \| FIO_RAWIO,
	413	};
	414
	415	#else /* FIO_HAVE_SGIO */
	416
	417	/*
	418	* When we have a proper configure system in place, we simply wont build
	419	* and install this io engine. For now install a crippled version that
	420	* just complains and fails to load.
	421	*/
	422	static int fio_sgio_init(struct thread_data fio_unused *td)
	423	{
	424	fprintf(stderr, "fio: sgio not available\n");
	425	return 1;
	426	}
	427
	428	static struct ioengine_ops ioengine = {
	429	.name = "sgio",
	430	.version = FIO_IOOPS_VERSION,
	431	.init = fio_sgio_init,
	432	};
	433
	434	#endif
	435
	436	static void fio_init fio_sgio_register(void)
	437	{
	438	register_ioengine(&ioengine);
	439	}
	440
	441	static void fio_exit fio_sgio_unregister(void)
	442	{
	443	unregister_ioengine(&ioengine);
	444	}