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