[fio.git] / engines / rados.c

/*
 *  Ceph Rados engine
 *
 * IO engine using Ceph's RADOS interface to test low-level performance of
 * Ceph OSDs.
 *
 */

#include <rados/librados.h>
#include <pthread.h>
#include "fio.h"
#include "../optgroup.h"

struct rados_data {
	rados_t cluster;
	rados_ioctx_t io_ctx;
	struct io_u **aio_events;
	bool connected;
	pthread_mutex_t completed_lock;
	pthread_cond_t completed_more_io;
	struct flist_head completed_operations;
	uint64_t ops_scheduled;
	uint64_t ops_completed;
};

struct fio_rados_iou {
	struct flist_head list;
	struct thread_data *td;
	struct io_u *io_u;
	rados_completion_t completion;
	rados_write_op_t write_op;
};

/* fio configuration options read from the job file */
struct rados_options {
	void *pad;
	char *cluster_name;
	char *pool_name;
	char *client_name;
	int busy_poll;
};

static struct fio_option options[] = {
	{
		.name     = "clustername",
		.lname    = "ceph cluster name",
		.type     = FIO_OPT_STR_STORE,
		.help     = "Cluster name for ceph",
		.off1     = offsetof(struct rados_options, cluster_name),
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_RBD,
	},
	{
		.name     = "pool",
		.lname    = "pool name to use",
		.type     = FIO_OPT_STR_STORE,
		.help     = "Ceph pool name to benchmark against",
		.off1     = offsetof(struct rados_options, pool_name),
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_RBD,
	},
	{
		.name     = "clientname",
		.lname    = "rados engine clientname",
		.type     = FIO_OPT_STR_STORE,
		.help     = "Name of the ceph client to access RADOS engine",
		.off1     = offsetof(struct rados_options, client_name),
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_RBD,
	},
	{
		.name     = "busy_poll",
		.lname    = "busy poll mode",
		.type     = FIO_OPT_BOOL,
		.help     = "Busy poll for completions instead of sleeping",
		.off1     = offsetof(struct rados_options, busy_poll),
		.def	  = "0",
		.category = FIO_OPT_C_ENGINE,
		.group    = FIO_OPT_G_RBD,
	},
	{
		.name     = NULL,
	},
};

static int _fio_setup_rados_data(struct thread_data *td,
				struct rados_data **rados_data_ptr)
{
	struct rados_data *rados;

	if (td->io_ops_data)
		return 0;

	rados = calloc(1, sizeof(struct rados_data));
	if (!rados)
		goto failed;

	rados->connected = false;

	rados->aio_events = calloc(td->o.iodepth, sizeof(struct io_u *));
	if (!rados->aio_events)
		goto failed;
	pthread_mutex_init(&rados->completed_lock, NULL);
	pthread_cond_init(&rados->completed_more_io, NULL);
	INIT_FLIST_HEAD(&rados->completed_operations);
	rados->ops_scheduled = 0;
	rados->ops_completed = 0;
	*rados_data_ptr = rados;
	return 0;

failed:
	if (rados) {
		if (rados->aio_events)
			free(rados->aio_events);
		free(rados);
	}
	return 1;
}

static void _fio_rados_rm_objects(struct thread_data *td, struct rados_data *rados)
{
	size_t i;
	for (i = 0; i < td->o.nr_files; i++) {
		struct fio_file *f = td->files[i];
		rados_remove(rados->io_ctx, f->file_name);
	}
}

static int _fio_rados_connect(struct thread_data *td)
{
	struct rados_data *rados = td->io_ops_data;
	struct rados_options *o = td->eo;
	int r;
	const uint64_t file_size =
		td->o.size / (td->o.nr_files ? td->o.nr_files : 1u);
	struct fio_file *f;
	uint32_t i;

	if (o->cluster_name) {
		char *client_name = NULL;

		/*
		* If we specify cluser name, the rados_create2
		* will not assume 'client.'. name is considered
		* as a full type.id namestr
		*/
		if (o->client_name) {
			if (!index(o->client_name, '.')) {
				client_name = calloc(1, strlen("client.") +
					strlen(o->client_name) + 1);
				strcat(client_name, "client.");
				strcat(client_name, o->client_name);
			} else {
				client_name = o->client_name;
			}
		}

		r = rados_create2(&rados->cluster, o->cluster_name,
			client_name, 0);

		if (client_name && !index(o->client_name, '.'))
			free(client_name);
	} else
		r = rados_create(&rados->cluster, o->client_name);

	if (o->pool_name == NULL) {
		log_err("rados pool name must be provided.\n");
		goto failed_early;
	}

	if (r < 0) {
		log_err("rados_create failed.\n");
		goto failed_early;
	}

	r = rados_conf_read_file(rados->cluster, NULL);
	if (r < 0) {
		log_err("rados_conf_read_file failed.\n");
		goto failed_early;
	}

	r = rados_connect(rados->cluster);
	if (r < 0) {
		log_err("rados_connect failed.\n");
		goto failed_early;
	}

	r = rados_ioctx_create(rados->cluster, o->pool_name, &rados->io_ctx);
	if (r < 0) {
		log_err("rados_ioctx_create failed.\n");
		goto failed_shutdown;
	}

	for (i = 0; i < td->o.nr_files; i++) {
		f = td->files[i];
		f->real_file_size = file_size;
		r = rados_write(rados->io_ctx, f->file_name, "", 0, 0);
		if (r < 0) {
			goto failed_obj_create;
		}
	}
	return 0;

failed_obj_create:
	_fio_rados_rm_objects(td, rados);
	rados_ioctx_destroy(rados->io_ctx);
	rados->io_ctx = NULL;
failed_shutdown:
	rados_shutdown(rados->cluster);
	rados->cluster = NULL;
failed_early:
	return 1;
}

static void _fio_rados_disconnect(struct rados_data *rados)
{
	if (!rados)
		return;

	if (rados->io_ctx) {
		rados_ioctx_destroy(rados->io_ctx);
		rados->io_ctx = NULL;
	}

	if (rados->cluster) {
		rados_shutdown(rados->cluster);
		rados->cluster = NULL;
	}
}

static void fio_rados_cleanup(struct thread_data *td)
{
	struct rados_data *rados = td->io_ops_data;
	if (rados) {
		pthread_mutex_lock(&rados->completed_lock);
		while (rados->ops_scheduled != rados->ops_completed)
			pthread_cond_wait(&rados->completed_more_io, &rados->completed_lock);
		pthread_mutex_unlock(&rados->completed_lock);
		_fio_rados_rm_objects(td, rados);
		_fio_rados_disconnect(rados);
		free(rados->aio_events);
		free(rados);
	}
}

static void complete_callback(rados_completion_t cb, void *arg)
{
	struct fio_rados_iou *fri = (struct fio_rados_iou *)arg;
	struct rados_data *rados = fri->td->io_ops_data;
	assert(fri->completion);
	assert(rados_aio_is_complete(fri->completion));
	pthread_mutex_lock(&rados->completed_lock);
	flist_add_tail(&fri->list, &rados->completed_operations);
	rados->ops_completed++;
	pthread_mutex_unlock(&rados->completed_lock);
	pthread_cond_signal(&rados->completed_more_io);
}

static enum fio_q_status fio_rados_queue(struct thread_data *td,
					 struct io_u *io_u)
{
	struct rados_data *rados = td->io_ops_data;
	struct fio_rados_iou *fri = io_u->engine_data;
	char *object = io_u->file->file_name;
	int r = -1;

	fio_ro_check(td, io_u);

	if (io_u->ddir == DDIR_WRITE) {
		 r = rados_aio_create_completion(fri, complete_callback,
			NULL, &fri->completion);
		if (r < 0) {
			log_err("rados_aio_create_completion failed.\n");
			goto failed;
		}

		r = rados_aio_write(rados->io_ctx, object, fri->completion,
			io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
		if (r < 0) {
			log_err("rados_write failed.\n");
			goto failed_comp;
		}
		rados->ops_scheduled++;
		return FIO_Q_QUEUED;
	} else if (io_u->ddir == DDIR_READ) {
		r = rados_aio_create_completion(fri, complete_callback,
			NULL, &fri->completion);
		if (r < 0) {
			log_err("rados_aio_create_completion failed.\n");
			goto failed;
		}
		r = rados_aio_read(rados->io_ctx, object, fri->completion,
			io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
		if (r < 0) {
			log_err("rados_aio_read failed.\n");
			goto failed_comp;
		}
		rados->ops_scheduled++;
		return FIO_Q_QUEUED;
	} else if (io_u->ddir == DDIR_TRIM) {
		r = rados_aio_create_completion(fri, complete_callback,
			NULL , &fri->completion);
		if (r < 0) {
			log_err("rados_aio_create_completion failed.\n");
			goto failed;
		}
		fri->write_op = rados_create_write_op();
		if (fri->write_op == NULL) {
			log_err("rados_create_write_op failed.\n");
			goto failed_comp;
		}
		rados_write_op_zero(fri->write_op, io_u->offset,
			io_u->xfer_buflen);
		r = rados_aio_write_op_operate(fri->write_op, rados->io_ctx,
			fri->completion, object, NULL, 0);
		if (r < 0) {
			log_err("rados_aio_write_op_operate failed.\n");
			goto failed_write_op;
		}
		rados->ops_scheduled++;
		return FIO_Q_QUEUED;
	 }

	log_err("WARNING: Only DDIR_READ, DDIR_WRITE and DDIR_TRIM are supported!");

failed_write_op:
	rados_release_write_op(fri->write_op);
failed_comp:
	rados_aio_release(fri->completion);
failed:
	io_u->error = -r;
	td_verror(td, io_u->error, "xfer");
	return FIO_Q_COMPLETED;
}

static struct io_u *fio_rados_event(struct thread_data *td, int event)
{
	struct rados_data *rados = td->io_ops_data;
	return rados->aio_events[event];
}

int fio_rados_getevents(struct thread_data *td, unsigned int min,
	unsigned int max, const struct timespec *t)
{
	struct rados_data *rados = td->io_ops_data;
	unsigned int events = 0;
	struct fio_rados_iou *fri;

	pthread_mutex_lock(&rados->completed_lock);
	while (events < min) {
		while (flist_empty(&rados->completed_operations)) {
			pthread_cond_wait(&rados->completed_more_io, &rados->completed_lock);
		}
		assert(!flist_empty(&rados->completed_operations));
		
		fri = flist_first_entry(&rados->completed_operations, struct fio_rados_iou, list);
		assert(fri->completion);
		assert(rados_aio_is_complete(fri->completion));
		if (fri->write_op != NULL) {
			rados_release_write_op(fri->write_op);
			fri->write_op = NULL;
		}
		rados_aio_release(fri->completion);
		fri->completion = NULL;

		rados->aio_events[events] = fri->io_u;
		events ++;
		flist_del(&fri->list);
		if (events >= max) break;
	}
	pthread_mutex_unlock(&rados->completed_lock);
	return events;
}

static int fio_rados_setup(struct thread_data *td)
{
	struct rados_data *rados = NULL;
	int r;
	/* allocate engine specific structure to deal with librados. */
	r = _fio_setup_rados_data(td, &rados);
	if (r) {
		log_err("fio_setup_rados_data failed.\n");
		goto cleanup;
	}
	td->io_ops_data = rados;

	/* Force single process mode.
	*/
	td->o.use_thread = 1;

	/* connect in the main thread to determine to determine
	* the size of the given RADOS block device. And disconnect
	* later on.
	*/
	r = _fio_rados_connect(td);
	if (r) {
		log_err("fio_rados_connect failed.\n");
		goto cleanup;
	}
	rados->connected = true;

	return 0;
cleanup:
	fio_rados_cleanup(td);
	return r;
}

/* open/invalidate are noops. we set the FIO_DISKLESSIO flag in ioengine_ops to
   prevent fio from creating the files
*/
static int fio_rados_open(struct thread_data *td, struct fio_file *f)
{
	return 0;
}
static int fio_rados_invalidate(struct thread_data *td, struct fio_file *f)
{
	return 0;
}

static void fio_rados_io_u_free(struct thread_data *td, struct io_u *io_u)
{
	struct fio_rados_iou *fri = io_u->engine_data;

	if (fri) {
		io_u->engine_data = NULL;
		fri->td = NULL;
		if (fri->completion)
			rados_aio_release(fri->completion);
		if (fri->write_op)
			rados_release_write_op(fri->write_op);
		free(fri);
	}
}

static int fio_rados_io_u_init(struct thread_data *td, struct io_u *io_u)
{
	struct fio_rados_iou *fri;
	fri = calloc(1, sizeof(*fri));
	fri->io_u = io_u;
	fri->td = td;
	INIT_FLIST_HEAD(&fri->list);
	io_u->engine_data = fri;
	return 0;
}

/* ioengine_ops for get_ioengine() */
FIO_STATIC struct ioengine_ops ioengine = {
	.name = "rados",
	.version		= FIO_IOOPS_VERSION,
	.flags			= FIO_DISKLESSIO,
	.setup			= fio_rados_setup,
	.queue			= fio_rados_queue,
	.getevents		= fio_rados_getevents,
	.event			= fio_rados_event,
	.cleanup		= fio_rados_cleanup,
	.open_file		= fio_rados_open,
	.invalidate		= fio_rados_invalidate,
	.options		= options,
	.io_u_init		= fio_rados_io_u_init,
	.io_u_free		= fio_rados_io_u_free,
	.option_struct_size	= sizeof(struct rados_options),
};

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

static void fio_exit fio_rados_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
d5f9b0ea IF	1	/*
	2	* Ceph Rados engine
	3	*
	4	* IO engine using Ceph's RADOS interface to test low-level performance of
	5	* Ceph OSDs.
	6	*
	7	*/
	8
	9	#include <rados/librados.h>
	10	#include <pthread.h>
	11	#include "fio.h"
	12	#include "../optgroup.h"
	13
a21dafb0	14	struct rados_data {
1e30d8d0 AK	15	rados_t cluster;
	16	rados_ioctx_t io_ctx;
	17	struct io_u **aio_events;
	18	bool connected;
	19	pthread_mutex_t completed_lock;
95625c6d	20	pthread_cond_t completed_more_io;
1e30d8d0 AK	21	struct flist_head completed_operations;
	22	uint64_t ops_scheduled;
	23	uint64_t ops_completed;
a21dafb0 AK	24	};
a21dafb0 AK	25
d5f9b0ea	26	struct fio_rados_iou {
a21dafb0	27	struct flist_head list;
d5f9b0ea IF	28	struct thread_data *td;
	29	struct io_u *io_u;
	30	rados_completion_t completion;
	31	rados_write_op_t write_op;
	32	};
	33
d5f9b0ea IF	34	/* fio configuration options read from the job file */
	35	struct rados_options {
	36	void *pad;
	37	char *cluster_name;
	38	char *pool_name;
	39	char *client_name;
	40	int busy_poll;
	41	};
	42
	43	static struct fio_option options[] = {
	44	{
	45	.name = "clustername",
	46	.lname = "ceph cluster name",
	47	.type = FIO_OPT_STR_STORE,
	48	.help = "Cluster name for ceph",
	49	.off1 = offsetof(struct rados_options, cluster_name),
	50	.category = FIO_OPT_C_ENGINE,
	51	.group = FIO_OPT_G_RBD,
	52	},
	53	{
	54	.name = "pool",
	55	.lname = "pool name to use",
	56	.type = FIO_OPT_STR_STORE,
	57	.help = "Ceph pool name to benchmark against",
	58	.off1 = offsetof(struct rados_options, pool_name),
	59	.category = FIO_OPT_C_ENGINE,
	60	.group = FIO_OPT_G_RBD,
	61	},
	62	{
	63	.name = "clientname",
	64	.lname = "rados engine clientname",
	65	.type = FIO_OPT_STR_STORE,
	66	.help = "Name of the ceph client to access RADOS engine",
	67	.off1 = offsetof(struct rados_options, client_name),
	68	.category = FIO_OPT_C_ENGINE,
	69	.group = FIO_OPT_G_RBD,
	70	},
	71	{
	72	.name = "busy_poll",
	73	.lname = "busy poll mode",
	74	.type = FIO_OPT_BOOL,
	75	.help = "Busy poll for completions instead of sleeping",
	76	.off1 = offsetof(struct rados_options, busy_poll),
	77	.def = "0",
	78	.category = FIO_OPT_C_ENGINE,
	79	.group = FIO_OPT_G_RBD,
	80	},
	81	{
	82	.name = NULL,
	83	},
	84	};
	85
	86	static int _fio_setup_rados_data(struct thread_data *td,
	87	struct rados_data **rados_data_ptr)
	88	{
	89	struct rados_data *rados;
	90
	91	if (td->io_ops_data)
	92	return 0;
	93
	94	rados = calloc(1, sizeof(struct rados_data));
	95	if (!rados)
	96	goto failed;
	97
98	rados->connected = false;
99
100	rados->aio_events = calloc(td->o.iodepth, sizeof(struct io_u *));
101	if (!rados->aio_events)
102	goto failed;
a21dafb0 AK	103	pthread_mutex_init(&rados->completed_lock, NULL);
	104	pthread_cond_init(&rados->completed_more_io, NULL);
	105	INIT_FLIST_HEAD(&rados->completed_operations);
1e30d8d0 AK	106	rados->ops_scheduled = 0;
1e30d8d0 AK	107	rados->ops_completed = 0;
d5f9b0ea IF	108	*rados_data_ptr = rados;
	109	return 0;
	110
	111	failed:
	112	if (rados) {
d5f9b0ea IF	113	if (rados->aio_events)
	114	free(rados->aio_events);
	115	free(rados);
	116	}
	117	return 1;
	118	}
	119
21f277b8	120	static void _fio_rados_rm_objects(struct thread_data td, struct rados_data rados)
d5f9b0ea IF	121	{
d5f9b0ea IF	122	size_t i;
21f277b8 AK	123	for (i = 0; i < td->o.nr_files; i++) {
	124	struct fio_file *f = td->files[i];
	125	rados_remove(rados->io_ctx, f->file_name);
d5f9b0ea IF	126	}
	127	}
	128
	129	static int _fio_rados_connect(struct thread_data *td)
	130	{
	131	struct rados_data *rados = td->io_ops_data;
	132	struct rados_options *o = td->eo;
	133	int r;
	134	const uint64_t file_size =
	135	td->o.size / (td->o.nr_files ? td->o.nr_files : 1u);
	136	struct fio_file *f;
	137	uint32_t i;
d5f9b0ea IF	138
	139	if (o->cluster_name) {
	140	char *client_name = NULL;
	141
	142	/*
	143	* If we specify cluser name, the rados_create2
	144	* will not assume 'client.'. name is considered
	145	* as a full type.id namestr
	146	*/
	147	if (o->client_name) {
	148	if (!index(o->client_name, '.')) {
	149	client_name = calloc(1, strlen("client.") +
	150	strlen(o->client_name) + 1);
	151	strcat(client_name, "client.");
	152	strcat(client_name, o->client_name);
	153	} else {
	154	client_name = o->client_name;
	155	}
	156	}
	157
	158	r = rados_create2(&rados->cluster, o->cluster_name,
	159	client_name, 0);
	160
	161	if (client_name && !index(o->client_name, '.'))
	162	free(client_name);
	163	} else
	164	r = rados_create(&rados->cluster, o->client_name);
	165
21f277b8 AK	166	if (o->pool_name == NULL) {
	167	log_err("rados pool name must be provided.\n");
	168	goto failed_early;
	169	}
	170
d5f9b0ea IF	171	if (r < 0) {
	172	log_err("rados_create failed.\n");
	173	goto failed_early;
	174	}
	175
	176	r = rados_conf_read_file(rados->cluster, NULL);
	177	if (r < 0) {
	178	log_err("rados_conf_read_file failed.\n");
	179	goto failed_early;
	180	}
	181
	182	r = rados_connect(rados->cluster);
	183	if (r < 0) {
	184	log_err("rados_connect failed.\n");
	185	goto failed_early;
	186	}
	187
	188	r = rados_ioctx_create(rados->cluster, o->pool_name, &rados->io_ctx);
	189	if (r < 0) {
	190	log_err("rados_ioctx_create failed.\n");
	191	goto failed_shutdown;
	192	}
	193
21f277b8	194	for (i = 0; i < td->o.nr_files; i++) {
d5f9b0ea IF	195	f = td->files[i];
d5f9b0ea IF	196	f->real_file_size = file_size;
21f277b8	197	r = rados_write(rados->io_ctx, f->file_name, "", 0, 0);
d5f9b0ea	198	if (r < 0) {
d5f9b0ea IF	199	goto failed_obj_create;
	200	}
	201	}
21f277b8	202	return 0;
d5f9b0ea IF	203
d5f9b0ea IF	204	failed_obj_create:
21f277b8	205	_fio_rados_rm_objects(td, rados);
d5f9b0ea IF	206	rados_ioctx_destroy(rados->io_ctx);
	207	rados->io_ctx = NULL;
	208	failed_shutdown:
	209	rados_shutdown(rados->cluster);
	210	rados->cluster = NULL;
	211	failed_early:
	212	return 1;
	213	}
	214
	215	static void _fio_rados_disconnect(struct rados_data *rados)
	216	{
	217	if (!rados)
	218	return;
	219
d5f9b0ea IF	220	if (rados->io_ctx) {
	221	rados_ioctx_destroy(rados->io_ctx);
	222	rados->io_ctx = NULL;
	223	}
	224
	225	if (rados->cluster) {
	226	rados_shutdown(rados->cluster);
	227	rados->cluster = NULL;
	228	}
	229	}
	230
	231	static void fio_rados_cleanup(struct thread_data *td)
	232	{
	233	struct rados_data *rados = td->io_ops_data;
d5f9b0ea	234	if (rados) {
1e30d8d0 AK	235	pthread_mutex_lock(&rados->completed_lock);
	236	while (rados->ops_scheduled != rados->ops_completed)
	237	pthread_cond_wait(&rados->completed_more_io, &rados->completed_lock);
	238	pthread_mutex_unlock(&rados->completed_lock);
21f277b8	239	_fio_rados_rm_objects(td, rados);
d5f9b0ea	240	_fio_rados_disconnect(rados);
d5f9b0ea IF	241	free(rados->aio_events);
	242	free(rados);
	243	}
	244	}
	245
a21dafb0 AK	246	static void complete_callback(rados_completion_t cb, void *arg)
	247	{
	248	struct fio_rados_iou fri = (struct fio_rados_iou )arg;
	249	struct rados_data *rados = fri->td->io_ops_data;
	250	assert(fri->completion);
	251	assert(rados_aio_is_complete(fri->completion));
	252	pthread_mutex_lock(&rados->completed_lock);
	253	flist_add_tail(&fri->list, &rados->completed_operations);
1e30d8d0	254	rados->ops_completed++;
a21dafb0 AK	255	pthread_mutex_unlock(&rados->completed_lock);
	256	pthread_cond_signal(&rados->completed_more_io);
	257	}
	258
2e4ef4fb JA	259	static enum fio_q_status fio_rados_queue(struct thread_data *td,
2e4ef4fb JA	260	struct io_u *io_u)
d5f9b0ea IF	261	{
	262	struct rados_data *rados = td->io_ops_data;
	263	struct fio_rados_iou *fri = io_u->engine_data;
21f277b8	264	char *object = io_u->file->file_name;
d5f9b0ea IF	265	int r = -1;
	266
	267	fio_ro_check(td, io_u);
	268
	269	if (io_u->ddir == DDIR_WRITE) {
a21dafb0	270	r = rados_aio_create_completion(fri, complete_callback,
d5f9b0ea IF	271	NULL, &fri->completion);
	272	if (r < 0) {
	273	log_err("rados_aio_create_completion failed.\n");
	274	goto failed;
	275	}
	276
	277	r = rados_aio_write(rados->io_ctx, object, fri->completion,
	278	io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	279	if (r < 0) {
	280	log_err("rados_write failed.\n");
	281	goto failed_comp;
	282	}
1e30d8d0	283	rados->ops_scheduled++;
d5f9b0ea IF	284	return FIO_Q_QUEUED;
d5f9b0ea IF	285	} else if (io_u->ddir == DDIR_READ) {
a21dafb0	286	r = rados_aio_create_completion(fri, complete_callback,
d5f9b0ea IF	287	NULL, &fri->completion);
	288	if (r < 0) {
	289	log_err("rados_aio_create_completion failed.\n");
	290	goto failed;
	291	}
	292	r = rados_aio_read(rados->io_ctx, object, fri->completion,
	293	io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
	294	if (r < 0) {
	295	log_err("rados_aio_read failed.\n");
	296	goto failed_comp;
	297	}
1e30d8d0	298	rados->ops_scheduled++;
d5f9b0ea IF	299	return FIO_Q_QUEUED;
d5f9b0ea IF	300	} else if (io_u->ddir == DDIR_TRIM) {
a21dafb0	301	r = rados_aio_create_completion(fri, complete_callback,
d5f9b0ea IF	302	NULL , &fri->completion);
	303	if (r < 0) {
	304	log_err("rados_aio_create_completion failed.\n");
	305	goto failed;
	306	}
	307	fri->write_op = rados_create_write_op();
	308	if (fri->write_op == NULL) {
	309	log_err("rados_create_write_op failed.\n");
	310	goto failed_comp;
	311	}
	312	rados_write_op_zero(fri->write_op, io_u->offset,
	313	io_u->xfer_buflen);
	314	r = rados_aio_write_op_operate(fri->write_op, rados->io_ctx,
	315	fri->completion, object, NULL, 0);
	316	if (r < 0) {
	317	log_err("rados_aio_write_op_operate failed.\n");
	318	goto failed_write_op;
	319	}
1e30d8d0	320	rados->ops_scheduled++;
d5f9b0ea IF	321	return FIO_Q_QUEUED;
	322	}
	323
	324	log_err("WARNING: Only DDIR_READ, DDIR_WRITE and DDIR_TRIM are supported!");
	325
	326	failed_write_op:
	327	rados_release_write_op(fri->write_op);
	328	failed_comp:
	329	rados_aio_release(fri->completion);
	330	failed:
	331	io_u->error = -r;
	332	td_verror(td, io_u->error, "xfer");
	333	return FIO_Q_COMPLETED;
	334	}
	335
	336	static struct io_u fio_rados_event(struct thread_data td, int event)
	337	{
	338	struct rados_data *rados = td->io_ops_data;
	339	return rados->aio_events[event];
	340	}
	341
	342	int fio_rados_getevents(struct thread_data *td, unsigned int min,
	343	unsigned int max, const struct timespec *t)
	344	{
	345	struct rados_data *rados = td->io_ops_data;
d5f9b0ea	346	unsigned int events = 0;
d5f9b0ea	347	struct fio_rados_iou *fri;
a21dafb0 AK	348
	349	pthread_mutex_lock(&rados->completed_lock);
	350	while (events < min) {
	351	while (flist_empty(&rados->completed_operations)) {
	352	pthread_cond_wait(&rados->completed_more_io, &rados->completed_lock);
d5f9b0ea	353	}
a21dafb0 AK	354	assert(!flist_empty(&rados->completed_operations));
a21dafb0 AK	355
6a3f4e6c	356	fri = flist_first_entry(&rados->completed_operations, struct fio_rados_iou, list);
a21dafb0 AK	357	assert(fri->completion);
	358	assert(rados_aio_is_complete(fri->completion));
	359	if (fri->write_op != NULL) {
	360	rados_release_write_op(fri->write_op);
	361	fri->write_op = NULL;
	362	}
	363	rados_aio_release(fri->completion);
	364	fri->completion = NULL;
	365
	366	rados->aio_events[events] = fri->io_u;
	367	events ++;
	368	flist_del(&fri->list);
	369	if (events >= max) break;
	370	}
	371	pthread_mutex_unlock(&rados->completed_lock);
	372	return events;
d5f9b0ea IF	373	}
	374
	375	static int fio_rados_setup(struct thread_data *td)
	376	{
	377	struct rados_data *rados = NULL;
	378	int r;
	379	/* allocate engine specific structure to deal with librados. */
	380	r = _fio_setup_rados_data(td, &rados);
	381	if (r) {
	382	log_err("fio_setup_rados_data failed.\n");
	383	goto cleanup;
	384	}
	385	td->io_ops_data = rados;
	386
	387	/* Force single process mode.
	388	*/
	389	td->o.use_thread = 1;
	390
	391	/* connect in the main thread to determine to determine
	392	* the size of the given RADOS block device. And disconnect
	393	* later on.
	394	*/
	395	r = _fio_rados_connect(td);
	396	if (r) {
	397	log_err("fio_rados_connect failed.\n");
	398	goto cleanup;
	399	}
	400	rados->connected = true;
	401
	402	return 0;
	403	cleanup:
	404	fio_rados_cleanup(td);
	405	return r;
	406	}
	407
	408	/* open/invalidate are noops. we set the FIO_DISKLESSIO flag in ioengine_ops to
	409	prevent fio from creating the files
	410	*/
	411	static int fio_rados_open(struct thread_data td, struct fio_file f)
	412	{
	413	return 0;
	414	}
	415	static int fio_rados_invalidate(struct thread_data td, struct fio_file f)
	416	{
	417	return 0;
	418	}
	419
	420	static void fio_rados_io_u_free(struct thread_data td, struct io_u io_u)
	421	{
	422	struct fio_rados_iou *fri = io_u->engine_data;
	423
	424	if (fri) {
	425	io_u->engine_data = NULL;
	426	fri->td = NULL;
	427	if (fri->completion)
	428	rados_aio_release(fri->completion);
	429	if (fri->write_op)
	430	rados_release_write_op(fri->write_op);
	431	free(fri);
	432	}
	433	}
	434
	435	static int fio_rados_io_u_init(struct thread_data td, struct io_u io_u)
	436	{
437	struct fio_rados_iou *fri;
438	fri = calloc(1, sizeof(*fri));
439	fri->io_u = io_u;
440	fri->td = td;
a21dafb0	441	INIT_FLIST_HEAD(&fri->list);
d5f9b0ea IF	442	io_u->engine_data = fri;
	443	return 0;
	444	}
	445
	446	/* ioengine_ops for get_ioengine() */
5a8a6a03	447	FIO_STATIC struct ioengine_ops ioengine = {
d5f9b0ea IF	448	.name = "rados",
	449	.version = FIO_IOOPS_VERSION,
	450	.flags = FIO_DISKLESSIO,
	451	.setup = fio_rados_setup,
	452	.queue = fio_rados_queue,
	453	.getevents = fio_rados_getevents,
	454	.event = fio_rados_event,
	455	.cleanup = fio_rados_cleanup,
	456	.open_file = fio_rados_open,
	457	.invalidate = fio_rados_invalidate,
	458	.options = options,
	459	.io_u_init = fio_rados_io_u_init,
	460	.io_u_free = fio_rados_io_u_free,
	461	.option_struct_size = sizeof(struct rados_options),
	462	};
	463
	464	static void fio_init fio_rados_register(void)
	465	{
	466	register_ioengine(&ioengine);
	467	}
	468
	469	static void fio_exit fio_rados_unregister(void)
	470	{
	471	unregister_ioengine(&ioengine);
	472	}