[fio.git] / engines / sg.c

/*
 * scsi generic sg v3 io engine
 *
 */
#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, events, i, r = 0;
	void *buf = sd->sgbuf;

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

	td->io_ops->data = sd;

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