[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:
	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 (ret != FIO_Q_BUSY)
		io_u_mark_depth(td, io_u);

	if (ret == FIO_Q_QUEUED) {
		int r;

		td->io_u_queued++;
		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)
		return 0;

	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;
		}
	}

	f->last_free_lookup = 0;
	f->last_pos = f->file_offset;
	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	dprint(FD_IO, "getevents: %d\n", r);
	202	return r;
	203	}
	204
	205	int td_io_queue(struct thread_data td, struct io_u io_u)
	206	{
	207	int ret;
	208
	209	dprint_io_u(io_u, "queue");
	210	fio_ro_check(td, io_u);
	211
	212	assert((io_u->flags & IO_U_F_FLIGHT) == 0);
	213	io_u->flags \|= IO_U_F_FLIGHT;
	214
	215	assert(io_u->file->flags & FIO_FILE_OPEN);
	216
	217	io_u->error = 0;
	218	io_u->resid = 0;
	219
	220	if (td->io_ops->flags & FIO_SYNCIO) {
	221	fio_gettime(&io_u->issue_time, NULL);
	222	memcpy(&td->last_issue, &io_u->issue_time,
	223	sizeof(struct timeval));
	224
	225	/*
	226	* for a sync engine, set the timeout upfront
	227	*/
	228	if (mtime_since(&td->timeout_end, &io_u->issue_time)
	229	< IO_U_TIMEOUT)
	230	io_u_set_timeout(td);
	231	}
	232
	233	if (io_u->ddir != DDIR_SYNC)
	234	td->io_issues[io_u->ddir]++;
	235
	236	ret = td->io_ops->queue(td, io_u);
	237
	238	unlock_file(td, io_u->file);
	239
	240	if (ret != FIO_Q_BUSY)
	241	io_u_mark_depth(td, io_u);
	242
	243	if (ret == FIO_Q_QUEUED) {
	244	int r;
	245
	246	td->io_u_queued++;
	247	if (td->io_u_queued > td->o.iodepth_batch) {
	248	r = td_io_commit(td);
	249	if (r < 0)
	250	return r;
	251	}
	252	}
	253
	254	if ((td->io_ops->flags & FIO_SYNCIO) == 0) {
	255	fio_gettime(&io_u->issue_time, NULL);
	256	memcpy(&td->last_issue, &io_u->issue_time,
	257	sizeof(struct timeval));
	258
	259	/*
	260	* async engine, set the timeout here
	261	*/
	262	if (ret == FIO_Q_QUEUED &&
	263	(mtime_since(&td->timeout_end, &io_u->issue_time)
	264	< IO_U_TIMEOUT)) {
	265	io_u_set_timeout(td);
	266	}
	267	}
	268
	269	return ret;
	270	}
	271
	272	int td_io_init(struct thread_data *td)
	273	{
	274	int ret = 0;
	275
	276	if (td->io_ops->init) {
	277	ret = td->io_ops->init(td);
	278	if (ret && td->o.iodepth > 1) {
	279	log_err("fio: io engine init failed. Perhaps try"
	280	" reducing io depth?\n");
	281	}
	282	}
	283
	284	return ret;
	285	}
	286
	287	int td_io_commit(struct thread_data *td)
	288	{
	289	dprint(FD_IO, "calling ->commit(), depth %d\n", td->cur_depth);
	290
	291	if (!td->cur_depth)
	292	return 0;
	293
	294	td->io_u_queued = 0;
	295	if (td->io_ops->commit)
	296	return td->io_ops->commit(td);
	297
	298	return 0;
	299	}
	300
	301	int td_io_open_file(struct thread_data td, struct fio_file f)
	302	{
	303	if (td->io_ops->open_file(td, f)) {
	304	if (td->error == EINVAL && td->o.odirect)
	305	log_err("fio: destination does not support O_DIRECT\n");
	306	if (td->error == EMFILE) {
	307	log_err("fio: try reducing/setting openfiles (failed"
	308	" at %u of %u)\n", td->nr_open_files,
	309	td->o.nr_files);
	310	}
	311
	312	return 1;
	313	}
	314
	315	if (f->filetype == FIO_TYPE_PIPE) {
	316	if (td_random(td)) {
	317	log_err("fio: can't seek on pipes (no random io)\n");
	318	goto err;
	319	}
	320	}
	321
	322	f->last_free_lookup = 0;
	323	f->last_pos = f->file_offset;
	324	f->flags \|= FIO_FILE_OPEN;
	325	f->flags &= ~FIO_FILE_CLOSING;
	326
	327	if (td->io_ops->flags & FIO_DISKLESSIO)
	328	goto done;
	329
	330	if (td->o.invalidate_cache && file_invalidate_cache(td, f))
	331	goto err;
	332
	333	if (td->o.fadvise_hint &&
	334	(f->filetype == FIO_TYPE_BD \|\| f->filetype == FIO_TYPE_FILE)) {
	335	int flags;
	336
	337	if (td_random(td))
	338	flags = POSIX_FADV_RANDOM;
	339	else
	340	flags = POSIX_FADV_SEQUENTIAL;
	341
	342	if (fadvise(f->fd, f->file_offset, f->io_size, flags) < 0) {
	343	td_verror(td, errno, "fadvise");
	344	goto err;
	345	}
	346	}
	347
	348	if (f->file_map)
	349	memset(f->file_map, 0, f->num_maps * sizeof(long));
	350
	351	done:
	352	log_file(td, f, FIO_LOG_OPEN_FILE);
	353	td->nr_open_files++;
	354	get_file(f);
	355	return 0;
	356	err:
	357	if (td->io_ops->close_file)
	358	td->io_ops->close_file(td, f);
	359	return 1;
	360	}
	361
	362	int td_io_close_file(struct thread_data td, struct fio_file f)
	363	{
	364	if (!(f->flags & FIO_FILE_CLOSING))
	365	log_file(td, f, FIO_LOG_CLOSE_FILE);
	366
	367	/*
	368	* mark as closing, do real close when last io on it has completed
	369	*/
	370	f->flags \|= FIO_FILE_CLOSING;
	371
	372	unlock_file_all(td, f);
	373
	374	return put_file(td, f);
	375	}