[fio.git] / ioengines.c

/*
 * The io parts of the fio tool, includes workers for sync and mmap'ed
 * io, as well as both posix and linux libaio support.
 *
 * sync io is implemented on top of aio.
 *
 * This is not really specific to fio, if the get_io_u/put_io_u and
 * structures was pulled into this as well it would be a perfectly
 * generic io engine that could be used for other projects.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dlfcn.h>
#include <assert.h>

#include "fio.h"

static LIST_HEAD(engine_list);

static int check_engine_ops(struct ioengine_ops *ops)
{
	if (ops->version != FIO_IOOPS_VERSION) {
		log_err("bad ioops version %d (want %d)\n", ops->version,
							FIO_IOOPS_VERSION);
		return 1;
	}

	if (!ops->queue) {
		log_err("%s: no queue handler\n", ops->name);
		return 1;
	}

	/*
	 * sync engines only need a ->queue()
	 */
	if (ops->flags & FIO_SYNCIO)
		return 0;

	if (!ops->event) {
		log_err("%s: no event handler\n", ops->name);
		return 1;
	}
	if (!ops->getevents) {
		log_err("%s: no getevents handler\n", ops->name);
		return 1;
	}
	if (!ops->queue) {
		log_err("%s: no queue handler\n", ops->name);
		return 1;
	}

	return 0;
}

void unregister_ioengine(struct ioengine_ops *ops)
{
	dprint(FD_IO, "ioengine %s unregistered\n", ops->name);
	list_del(&ops->list);
	INIT_LIST_HEAD(&ops->list);
}

void register_ioengine(struct ioengine_ops *ops)
{
	dprint(FD_IO, "ioengine %s registered\n", ops->name);
	INIT_LIST_HEAD(&ops->list);
	list_add_tail(&ops->list, &engine_list);
}

static struct ioengine_ops *find_ioengine(const char *name)
{
	struct ioengine_ops *ops;
	struct list_head *entry;

	list_for_each(entry, &engine_list) {
		ops = list_entry(entry, struct ioengine_ops, list);
		if (!strcmp(name, ops->name))
			return ops;
	}

	return NULL;
}

static struct ioengine_ops *dlopen_ioengine(struct thread_data *td,
					    const char *engine_lib)
{
	struct ioengine_ops *ops;
	void *dlhandle;

	dprint(FD_IO, "dload engine %s\n", engine_lib);

	dlerror();
	dlhandle = dlopen(engine_lib, RTLD_LAZY);
	if (!dlhandle) {
		td_vmsg(td, -1, dlerror(), "dlopen");
		return NULL;
	}

	/*
	 * Unlike the included modules, external engines should have a
	 * non-static ioengine structure that we can reference.
	 */
	ops = dlsym(dlhandle, "ioengine");
	if (!ops) {
		td_vmsg(td, -1, dlerror(), "dlsym");
		dlclose(dlhandle);
		return NULL;
	}

	ops->dlhandle = dlhandle;
	return ops;
}

struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name)
{
	struct ioengine_ops *ops, *ret;
	char engine[16];

	dprint(FD_IO, "load ioengine %s\n", name);

	strncpy(engine, name, sizeof(engine) - 1);

	/*
	 * linux libaio has alias names, so convert to what we want
	 */
	if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
		strcpy(engine, "libaio");

	ops = find_ioengine(engine);
	if (!ops)
		ops = dlopen_ioengine(td, name);

	if (!ops) {
		log_err("fio: engine %s not loadable\n", name);
		return NULL;
	}

	/*
	 * Check that the required methods are there.
	 */
	if (check_engine_ops(ops))
		return NULL;

	ret = malloc(sizeof(*ret));
	memcpy(ret, ops, sizeof(*ret));
	ret->data = NULL;

	return ret;
}

void close_ioengine(struct thread_data *td)
{
	dprint(FD_IO, "close ioengine %s\n", td->io_ops->name);

	if (td->io_ops->cleanup)
		td->io_ops->cleanup(td);

	if (td->io_ops->dlhandle)
		dlclose(td->io_ops->dlhandle);

	free(td->io_ops);
	td->io_ops = NULL;
}

int td_io_prep(struct thread_data *td, struct io_u *io_u)
{
	dprint_io_u(io_u, "prep");
	fio_ro_check(td, io_u);

	lock_file(td, io_u->file, io_u->ddir);

	if (td->io_ops->prep) {
		int ret = td->io_ops->prep(td, io_u);

		dprint(FD_IO, "->prep(%p)=%d\n", io_u, ret);
		if (ret)
			unlock_file(td, io_u->file);
		return ret;
	}

	return 0;
}

int td_io_getevents(struct thread_data *td, unsigned int min, unsigned int max,
		    struct timespec *t)
{
	int r = 0;

	if (min > 0 && td->io_ops->commit) {
		r = td->io_ops->commit(td);
		if (r < 0)
			goto out;
	}

	r = 0;
	if (td->io_ops->getevents)
		r = td->io_ops->getevents(td, min, max, t);
out:
	if (r >= 0)
		io_u_mark_complete(td, r);
	dprint(FD_IO, "getevents: %d\n", r);
	return r;
}

int td_io_queue(struct thread_data *td, struct io_u *io_u)
{
	int ret;

	dprint_io_u(io_u, "queue");
	fio_ro_check(td, io_u);

	assert((io_u->flags & IO_U_F_FLIGHT) == 0);
	io_u->flags |= IO_U_F_FLIGHT;

	assert(io_u->file->flags & FIO_FILE_OPEN);

	io_u->error = 0;
	io_u->resid = 0;

	if (td->io_ops->flags & FIO_SYNCIO) {
		fio_gettime(&io_u->issue_time, NULL);
		memcpy(&td->last_issue, &io_u->issue_time,
					sizeof(struct timeval));

		/*
		 * for a sync engine, set the timeout upfront
		 */
		if (mtime_since(&td->timeout_end, &io_u->issue_time)
		    < IO_U_TIMEOUT)
			io_u_set_timeout(td);
	}

	if (io_u->ddir != DDIR_SYNC)
		td->io_issues[io_u->ddir]++;

	ret = td->io_ops->queue(td, io_u);

	unlock_file(td, io_u->file);

	if (!td->io_ops->commit) {
		io_u_mark_submit(td, 1);
		io_u_mark_complete(td, 1);
	}

	if (ret == FIO_Q_COMPLETED) {
		if (io_u->ddir != DDIR_SYNC) {
			io_u_mark_depth(td, 1);
			td->ts.total_io_u[io_u->ddir]++;
		}
	} else if (ret == FIO_Q_QUEUED) {
		int r;

		if (io_u->ddir != DDIR_SYNC) {
			td->io_u_queued++;
			td->ts.total_io_u[io_u->ddir]++;
		}

		if (td->io_u_queued >= td->o.iodepth_batch) {
			r = td_io_commit(td);
			if (r < 0)
				return r;
		}
	}

	if ((td->io_ops->flags & FIO_SYNCIO) == 0) {
		fio_gettime(&io_u->issue_time, NULL);
		memcpy(&td->last_issue, &io_u->issue_time,
				sizeof(struct timeval));

		/*
		 * async engine, set the timeout here
		 */
		if (ret == FIO_Q_QUEUED &&
		    (mtime_since(&td->timeout_end, &io_u->issue_time)
			< IO_U_TIMEOUT)) {
			io_u_set_timeout(td);
		}
	}

	return ret;
}

int td_io_init(struct thread_data *td)
{
	int ret = 0;

	if (td->io_ops->init) {
		ret = td->io_ops->init(td);
		if (ret && td->o.iodepth > 1) {
			log_err("fio: io engine init failed. Perhaps try"
				" reducing io depth?\n");
		}
	}

	return ret;
}

int td_io_commit(struct thread_data *td)
{
	dprint(FD_IO, "calling ->commit(), depth %d\n", td->cur_depth);

	if (!td->cur_depth || !td->io_u_queued)
		return 0;

	io_u_mark_depth(td, td->io_u_queued);
	td->io_u_queued = 0;

	if (td->io_ops->commit)
		return td->io_ops->commit(td);

	return 0;
}

int td_io_open_file(struct thread_data *td, struct fio_file *f)
{
	if (td->io_ops->open_file(td, f)) {
		if (td->error == EINVAL && td->o.odirect)
			log_err("fio: destination does not support O_DIRECT\n");
		if (td->error == EMFILE) {
			log_err("fio: try reducing/setting openfiles (failed"
				" at %u of %u)\n", td->nr_open_files,
							td->o.nr_files);
		}

		return 1;
	}

	if (f->filetype == FIO_TYPE_PIPE) {
		if (td_random(td)) {
			log_err("fio: can't seek on pipes (no random io)\n");
			goto err;
		}
	}

	fio_file_reset(f);
	f->flags |= FIO_FILE_OPEN;
	f->flags &= ~FIO_FILE_CLOSING;

	if (td->io_ops->flags & FIO_DISKLESSIO)
		goto done;

	if (td->o.invalidate_cache && file_invalidate_cache(td, f))
		goto err;

	if (td->o.fadvise_hint &&
	    (f->filetype == FIO_TYPE_BD || f->filetype == FIO_TYPE_FILE)) {
		int flags;

		if (td_random(td))
			flags = POSIX_FADV_RANDOM;
		else
			flags = POSIX_FADV_SEQUENTIAL;

		if (fadvise(f->fd, f->file_offset, f->io_size, flags) < 0) {
			td_verror(td, errno, "fadvise");
			goto err;
		}
	}

	if (f->file_map)
		memset(f->file_map, 0, f->num_maps * sizeof(long));

done:
	log_file(td, f, FIO_LOG_OPEN_FILE);
	td->nr_open_files++;
	get_file(f);
	return 0;
err:
	if (td->io_ops->close_file)
		td->io_ops->close_file(td, f);
	return 1;
}

int td_io_close_file(struct thread_data *td, struct fio_file *f)
{
	if (!(f->flags & FIO_FILE_CLOSING))
		log_file(td, f, FIO_LOG_CLOSE_FILE);

	/*
	 * mark as closing, do real close when last io on it has completed
	 */
	f->flags |= FIO_FILE_CLOSING;

	unlock_file_all(td, f);

	return put_file(td, f);
}
Commit	Line	Data
	1	/*
	2	* The io parts of the fio tool, includes workers for sync and mmap'ed
	3	* io, as well as both posix and linux libaio support.
	4	*
	5	* sync io is implemented on top of aio.
	6	*
	7	* This is not really specific to fio, if the get_io_u/put_io_u and
	8	* structures was pulled into this as well it would be a perfectly
	9	* generic io engine that could be used for other projects.
	10	*
	11	*/
	12	#include <stdio.h>
	13	#include <stdlib.h>
	14	#include <unistd.h>
	15	#include <string.h>
	16	#include <dlfcn.h>
	17	#include <assert.h>
	18
	19	#include "fio.h"
	20
	21	static LIST_HEAD(engine_list);
	22
	23	static int check_engine_ops(struct ioengine_ops *ops)
	24	{
	25	if (ops->version != FIO_IOOPS_VERSION) {
	26	log_err("bad ioops version %d (want %d)\n", ops->version,
	27	FIO_IOOPS_VERSION);
	28	return 1;
	29	}
	30
	31	if (!ops->queue) {
	32	log_err("%s: no queue handler\n", ops->name);
	33	return 1;
	34	}
	35
	36	/*
	37	* sync engines only need a ->queue()
	38	*/
	39	if (ops->flags & FIO_SYNCIO)
	40	return 0;
	41
	42	if (!ops->event) {
	43	log_err("%s: no event handler\n", ops->name);
	44	return 1;
	45	}
	46	if (!ops->getevents) {
	47	log_err("%s: no getevents handler\n", ops->name);
	48	return 1;
	49	}
	50	if (!ops->queue) {
	51	log_err("%s: no queue handler\n", ops->name);
	52	return 1;
	53	}
	54
	55	return 0;
	56	}
	57
	58	void unregister_ioengine(struct ioengine_ops *ops)
	59	{
	60	dprint(FD_IO, "ioengine %s unregistered\n", ops->name);
	61	list_del(&ops->list);
	62	INIT_LIST_HEAD(&ops->list);
	63	}
	64
	65	void register_ioengine(struct ioengine_ops *ops)
	66	{
	67	dprint(FD_IO, "ioengine %s registered\n", ops->name);
	68	INIT_LIST_HEAD(&ops->list);
	69	list_add_tail(&ops->list, &engine_list);
	70	}
	71
	72	static struct ioengine_ops find_ioengine(const char name)
	73	{
	74	struct ioengine_ops *ops;
	75	struct list_head *entry;
	76
	77	list_for_each(entry, &engine_list) {
	78	ops = list_entry(entry, struct ioengine_ops, list);
	79	if (!strcmp(name, ops->name))
	80	return ops;
	81	}
	82
	83	return NULL;
	84	}
	85
	86	static struct ioengine_ops dlopen_ioengine(struct thread_data td,
	87	const char *engine_lib)
	88	{
	89	struct ioengine_ops *ops;
	90	void *dlhandle;
	91
	92	dprint(FD_IO, "dload engine %s\n", engine_lib);
	93
	94	dlerror();
	95	dlhandle = dlopen(engine_lib, RTLD_LAZY);
	96	if (!dlhandle) {
	97	td_vmsg(td, -1, dlerror(), "dlopen");
	98	return NULL;
	99	}
	100
	101	/*
	102	* Unlike the included modules, external engines should have a
	103	* non-static ioengine structure that we can reference.
	104	*/
	105	ops = dlsym(dlhandle, "ioengine");
	106	if (!ops) {
	107	td_vmsg(td, -1, dlerror(), "dlsym");
	108	dlclose(dlhandle);
	109	return NULL;
	110	}
	111
	112	ops->dlhandle = dlhandle;
	113	return ops;
	114	}
	115
	116	struct ioengine_ops load_ioengine(struct thread_data td, const char *name)
	117	{
	118	struct ioengine_ops ops, ret;
	119	char engine[16];
	120
	121	dprint(FD_IO, "load ioengine %s\n", name);
	122
	123	strncpy(engine, name, sizeof(engine) - 1);
	124
	125	/*
	126	* linux libaio has alias names, so convert to what we want
	127	*/
	128	if (!strncmp(engine, "linuxaio", 8) \|\| !strncmp(engine, "aio", 3))
	129	strcpy(engine, "libaio");
	130
	131	ops = find_ioengine(engine);
	132	if (!ops)
	133	ops = dlopen_ioengine(td, name);
	134
	135	if (!ops) {
	136	log_err("fio: engine %s not loadable\n", name);
	137	return NULL;
	138	}
	139
	140	/*
	141	* Check that the required methods are there.
	142	*/
	143	if (check_engine_ops(ops))
	144	return NULL;
	145
	146	ret = malloc(sizeof(*ret));
	147	memcpy(ret, ops, sizeof(*ret));
	148	ret->data = NULL;
	149
	150	return ret;
	151	}
	152
	153	void close_ioengine(struct thread_data *td)
	154	{
	155	dprint(FD_IO, "close ioengine %s\n", td->io_ops->name);
	156
	157	if (td->io_ops->cleanup)
	158	td->io_ops->cleanup(td);
	159
	160	if (td->io_ops->dlhandle)
	161	dlclose(td->io_ops->dlhandle);
	162
	163	free(td->io_ops);
	164	td->io_ops = NULL;
	165	}
	166
	167	int td_io_prep(struct thread_data td, struct io_u io_u)
	168	{
	169	dprint_io_u(io_u, "prep");
	170	fio_ro_check(td, io_u);
	171
	172	lock_file(td, io_u->file, io_u->ddir);
	173
	174	if (td->io_ops->prep) {
	175	int ret = td->io_ops->prep(td, io_u);
	176
	177	dprint(FD_IO, "->prep(%p)=%d\n", io_u, ret);
	178	if (ret)
	179	unlock_file(td, io_u->file);
	180	return ret;
	181	}
	182
	183	return 0;
	184	}
	185
	186	int td_io_getevents(struct thread_data *td, unsigned int min, unsigned int max,
	187	struct timespec *t)
	188	{
	189	int r = 0;
	190
	191	if (min > 0 && td->io_ops->commit) {
	192	r = td->io_ops->commit(td);
	193	if (r < 0)
	194	goto out;
	195	}
	196
	197	r = 0;
	198	if (td->io_ops->getevents)
	199	r = td->io_ops->getevents(td, min, max, t);
	200	out:
	201	if (r >= 0)
	202	io_u_mark_complete(td, r);
	203	dprint(FD_IO, "getevents: %d\n", r);
	204	return r;
	205	}
	206
	207	int td_io_queue(struct thread_data td, struct io_u io_u)
	208	{
	209	int ret;
	210
	211	dprint_io_u(io_u, "queue");
	212	fio_ro_check(td, io_u);
	213
	214	assert((io_u->flags & IO_U_F_FLIGHT) == 0);
	215	io_u->flags \|= IO_U_F_FLIGHT;
	216
	217	assert(io_u->file->flags & FIO_FILE_OPEN);
	218
	219	io_u->error = 0;
	220	io_u->resid = 0;
	221
	222	if (td->io_ops->flags & FIO_SYNCIO) {
	223	fio_gettime(&io_u->issue_time, NULL);
	224	memcpy(&td->last_issue, &io_u->issue_time,
	225	sizeof(struct timeval));
	226
	227	/*
	228	* for a sync engine, set the timeout upfront
	229	*/
	230	if (mtime_since(&td->timeout_end, &io_u->issue_time)
	231	< IO_U_TIMEOUT)
	232	io_u_set_timeout(td);
	233	}
	234
	235	if (io_u->ddir != DDIR_SYNC)
	236	td->io_issues[io_u->ddir]++;
	237
	238	ret = td->io_ops->queue(td, io_u);
	239
	240	unlock_file(td, io_u->file);
	241
	242	if (!td->io_ops->commit) {
	243	io_u_mark_submit(td, 1);
	244	io_u_mark_complete(td, 1);
	245	}
	246
	247	if (ret == FIO_Q_COMPLETED) {
	248	if (io_u->ddir != DDIR_SYNC) {
	249	io_u_mark_depth(td, 1);
	250	td->ts.total_io_u[io_u->ddir]++;
	251	}
	252	} else if (ret == FIO_Q_QUEUED) {
	253	int r;
	254
	255	if (io_u->ddir != DDIR_SYNC) {
	256	td->io_u_queued++;
	257	td->ts.total_io_u[io_u->ddir]++;
	258	}
	259
	260	if (td->io_u_queued >= td->o.iodepth_batch) {
	261	r = td_io_commit(td);
	262	if (r < 0)
	263	return r;
	264	}
	265	}
	266
	267	if ((td->io_ops->flags & FIO_SYNCIO) == 0) {
	268	fio_gettime(&io_u->issue_time, NULL);
	269	memcpy(&td->last_issue, &io_u->issue_time,
	270	sizeof(struct timeval));
	271
	272	/*
	273	* async engine, set the timeout here
	274	*/
	275	if (ret == FIO_Q_QUEUED &&
	276	(mtime_since(&td->timeout_end, &io_u->issue_time)
	277	< IO_U_TIMEOUT)) {
	278	io_u_set_timeout(td);
	279	}
	280	}
	281
	282	return ret;
	283	}
	284
	285	int td_io_init(struct thread_data *td)
	286	{
	287	int ret = 0;
	288
	289	if (td->io_ops->init) {
	290	ret = td->io_ops->init(td);
	291	if (ret && td->o.iodepth > 1) {
	292	log_err("fio: io engine init failed. Perhaps try"
	293	" reducing io depth?\n");
	294	}
	295	}
	296
	297	return ret;
	298	}
	299
	300	int td_io_commit(struct thread_data *td)
	301	{
	302	dprint(FD_IO, "calling ->commit(), depth %d\n", td->cur_depth);
	303
	304	if (!td->cur_depth \|\| !td->io_u_queued)
	305	return 0;
	306
	307	io_u_mark_depth(td, td->io_u_queued);
	308	td->io_u_queued = 0;
	309
	310	if (td->io_ops->commit)
	311	return td->io_ops->commit(td);
	312
	313	return 0;
	314	}
	315
	316	int td_io_open_file(struct thread_data td, struct fio_file f)
	317	{
	318	if (td->io_ops->open_file(td, f)) {
	319	if (td->error == EINVAL && td->o.odirect)
	320	log_err("fio: destination does not support O_DIRECT\n");
	321	if (td->error == EMFILE) {
	322	log_err("fio: try reducing/setting openfiles (failed"
	323	" at %u of %u)\n", td->nr_open_files,
	324	td->o.nr_files);
	325	}
	326
	327	return 1;
	328	}
	329
	330	if (f->filetype == FIO_TYPE_PIPE) {
	331	if (td_random(td)) {
	332	log_err("fio: can't seek on pipes (no random io)\n");
	333	goto err;
	334	}
	335	}
	336
	337	fio_file_reset(f);
	338	f->flags \|= FIO_FILE_OPEN;
	339	f->flags &= ~FIO_FILE_CLOSING;
	340
	341	if (td->io_ops->flags & FIO_DISKLESSIO)
	342	goto done;
	343
	344	if (td->o.invalidate_cache && file_invalidate_cache(td, f))
	345	goto err;
	346
	347	if (td->o.fadvise_hint &&
	348	(f->filetype == FIO_TYPE_BD \|\| f->filetype == FIO_TYPE_FILE)) {
	349	int flags;
	350
	351	if (td_random(td))
	352	flags = POSIX_FADV_RANDOM;
	353	else
	354	flags = POSIX_FADV_SEQUENTIAL;
	355
	356	if (fadvise(f->fd, f->file_offset, f->io_size, flags) < 0) {
	357	td_verror(td, errno, "fadvise");
	358	goto err;
	359	}
	360	}
	361
	362	if (f->file_map)
	363	memset(f->file_map, 0, f->num_maps * sizeof(long));
	364
	365	done:
	366	log_file(td, f, FIO_LOG_OPEN_FILE);
	367	td->nr_open_files++;
	368	get_file(f);
	369	return 0;
	370	err:
	371	if (td->io_ops->close_file)
	372	td->io_ops->close_file(td, f);
	373	return 1;
	374	}
	375
	376	int td_io_close_file(struct thread_data td, struct fio_file f)
	377	{
	378	if (!(f->flags & FIO_FILE_CLOSING))
	379	log_file(td, f, FIO_LOG_CLOSE_FILE);
	380
	381	/*
	382	* mark as closing, do real close when last io on it has completed
	383	*/
	384	f->flags \|= FIO_FILE_CLOSING;
	385
	386	unlock_file_all(td, f);
	387
	388	return put_file(td, f);
	389	}