summaryrefslogtreecommitdiffstats
path: root/src/test/fio/fio_ceph_messenger.cc
blob: 81680f102dd13cc10e4c701c21086757bec1f0c4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
 *  CEPH messenger engine
 *
 *  FIO engine which uses ceph messenger as a transport.  See corresponding
 *  FIO client and server jobs for details.
 */

#include "global/global_init.h"
#include "msg/Messenger.h"
#include "messages/MOSDOp.h"
#include "messages/MOSDOpReply.h"
#include "common/perf_counters.h"
#include "auth/DummyAuth.h"
#include "ring_buffer.h"

#include <fio.h>
#include <flist.h>
#include <optgroup.h>

#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_

using namespace std;

enum ceph_msgr_type {
  CEPH_MSGR_TYPE_UNDEF,
  CEPH_MSGR_TYPE_POSIX,
  CEPH_MSGR_TYPE_DPDK,
  CEPH_MSGR_TYPE_RDMA,
};

const char *ceph_msgr_types[] = { "undef", "async+posix",
				  "async+dpdk", "async+rdma" };

struct ceph_msgr_options {
  struct thread_data *td__;
  unsigned int is_receiver;
  unsigned int is_single;
  unsigned int port;
  const char *hostname;
  const char *conffile;
  enum ceph_msgr_type ms_type;
};

class FioDispatcher;

struct ceph_msgr_data {
  ceph_msgr_data(struct ceph_msgr_options *o_, unsigned iodepth) :
    o(o_) {
    INIT_FLIST_HEAD(&io_inflight_list);
    INIT_FLIST_HEAD(&io_pending_list);
    ring_buffer_init(&io_completed_q, iodepth);
    pthread_spin_init(&spin, PTHREAD_PROCESS_PRIVATE);
  }

  struct ceph_msgr_options *o;
  Messenger *msgr = NULL;
  FioDispatcher *disp = NULL;
  pthread_spinlock_t spin;
  struct ring_buffer io_completed_q;
  struct flist_head io_inflight_list;
  struct flist_head io_pending_list;
  unsigned int io_inflight_nr = 0;
  unsigned int io_pending_nr  = 0;
};

struct ceph_msgr_io {
  struct flist_head list;
  struct ceph_msgr_data *data;
  struct io_u *io_u;
  MOSDOp *req_msg; /** Cached request, valid only for sender */
};

struct ceph_msgr_reply_io {
  struct flist_head list;
  MOSDOpReply *rep;
};

static void *str_to_ptr(const std::string &str)
{
  // str is assumed to be a valid ptr string
  return reinterpret_cast<void*>(ceph::parse<uintptr_t>(str, 16).value());
}

static std::string ptr_to_str(void *ptr)
{
  char buf[32];

  snprintf(buf, sizeof(buf), "%llx", (unsigned long long)ptr);
  return std::string(buf);
}

/*
 * Used for refcounters print on the last context put, almost duplicates
 * global context refcounter, sigh.
 */
static std::atomic<int> ctx_ref(1);
static DummyAuthClientServer *g_dummy_auth;

static void create_or_get_ceph_context(struct ceph_msgr_options *o)
{
  if (g_ceph_context) {
    g_ceph_context->get();
    ctx_ref++;
    return;
  }

  boost::intrusive_ptr<CephContext> cct;
  vector<const char*> args;

  if (o->conffile)
    args = { "--conf", o->conffile };

  cct = global_init(NULL, args, CEPH_ENTITY_TYPE_CLIENT,
		    CODE_ENVIRONMENT_UTILITY,
		    CINIT_FLAG_NO_DEFAULT_CONFIG_FILE);
  /* Will use g_ceph_context instead */
  cct.detach();

  common_init_finish(g_ceph_context);
  g_ceph_context->_conf.apply_changes(NULL);
  g_dummy_auth = new DummyAuthClientServer(g_ceph_context);
  g_dummy_auth->auth_registry.refresh_config();
}

static void put_ceph_context(void)
{
  if (--ctx_ref == 0) {
    ostringstream ostr;
    Formatter* f;

    f = Formatter::create("json-pretty");
    g_ceph_context->get_perfcounters_collection()->dump_formatted(f, false, false);
    ostr << ">>>>>>>>>>>>> PERFCOUNTERS BEGIN <<<<<<<<<<<<" << std::endl;
    f->flush(ostr);
    ostr << ">>>>>>>>>>>>>  PERFCOUNTERS END  <<<<<<<<<<<<" << std::endl;

    delete f;
    delete g_dummy_auth;
    dout(0) <<  ostr.str() << dendl;
  }

  g_ceph_context->put();
}

static void ceph_msgr_sender_on_reply(const object_t &oid)
{
  struct ceph_msgr_data *data;
  struct ceph_msgr_io *io;

  /*
   * Here we abuse object and use it as a raw pointer. Since this is
   * only for benchmarks and testing we do not care about anything
   * but performance.  So no need to use global structure in order
   * to search for reply, just send a pointer and get it back.
   */

  io = (decltype(io))str_to_ptr(oid.name);
  data = io->data;
  ring_buffer_enqueue(&data->io_completed_q, (void *)io);
}


class ReplyCompletion : public Message::CompletionHook {
  struct ceph_msgr_io *m_io;

public:
  ReplyCompletion(MOSDOpReply *rep, struct ceph_msgr_io *io) :
    Message::CompletionHook(rep),
    m_io(io) {
  }
  void finish(int err) override {
    struct ceph_msgr_data *data = m_io->data;

    ring_buffer_enqueue(&data->io_completed_q, (void *)m_io);
  }
};

static void ceph_msgr_receiver_on_request(struct ceph_msgr_data *data,
					  MOSDOp *req)
{
  MOSDOpReply *rep;

  rep = new MOSDOpReply(req, 0, 0, 0, false);
  rep->set_connection(req->get_connection());

  pthread_spin_lock(&data->spin);
  if (data->io_inflight_nr) {
    struct ceph_msgr_io *io;

    data->io_inflight_nr--;
    io = flist_first_entry(&data->io_inflight_list,
			   struct ceph_msgr_io, list);
    flist_del(&io->list);
    pthread_spin_unlock(&data->spin);

    rep->set_completion_hook(new ReplyCompletion(rep, io));
    rep->get_connection()->send_message(rep);
  } else {
    struct ceph_msgr_reply_io *rep_io;

    rep_io = (decltype(rep_io))malloc(sizeof(*rep_io));
    rep_io->rep = rep;

    data->io_pending_nr++;
    flist_add_tail(&rep_io->list, &data->io_pending_list);
    pthread_spin_unlock(&data->spin);
  }
}

class FioDispatcher : public Dispatcher {
  struct ceph_msgr_data *m_data;

public:
  FioDispatcher(struct ceph_msgr_data *data):
    Dispatcher(g_ceph_context),
    m_data(data) {
  }
  bool ms_can_fast_dispatch_any() const override {
    return true;
  }
  bool ms_can_fast_dispatch(const Message *m) const override {
    switch (m->get_type()) {
    case CEPH_MSG_OSD_OP:
      return m_data->o->is_receiver;
    case CEPH_MSG_OSD_OPREPLY:
      return !m_data->o->is_receiver;
    default:
      return false;
    }
  }
  void ms_handle_fast_connect(Connection *con) override {
  }
  void ms_handle_fast_accept(Connection *con) override {
  }
  bool ms_dispatch(Message *m) override {
    return true;
  }
  void ms_fast_dispatch(Message *m) override {
    if (m_data->o->is_receiver) {
      MOSDOp *req;

      /*
       * Server side, handle request.
       */

      req = static_cast<MOSDOp*>(m);
      req->finish_decode();

      ceph_msgr_receiver_on_request(m_data, req);
    } else {
      MOSDOpReply *rep;

      /*
       * Client side, get reply, extract objid and mark
       * IO as completed.
       */

      rep = static_cast<MOSDOpReply*>(m);
      ceph_msgr_sender_on_reply(rep->get_oid());
    }
    m->put();
  }
  bool ms_handle_reset(Connection *con) override {
    return true;
  }
  void ms_handle_remote_reset(Connection *con) override {
  }
  bool ms_handle_refused(Connection *con) override {
    return false;
  }
  int ms_handle_fast_authentication(Connection *con) override {
    return 1;
  }
};

static entity_addr_t hostname_to_addr(struct ceph_msgr_options *o)
{
  entity_addr_t addr;

  addr.parse(o->hostname);
  addr.set_port(o->port);
  addr.set_nonce(0);

  return addr;
}

static Messenger *create_messenger(struct ceph_msgr_options *o)
{
  entity_name_t ename = o->is_receiver ?
    entity_name_t::OSD(0) : entity_name_t::CLIENT(0);
  std::string lname = o->is_receiver ?
    "receiver" : "sender";

  std::string ms_type = o->ms_type != CEPH_MSGR_TYPE_UNDEF ?
    ceph_msgr_types[o->ms_type] :
    g_ceph_context->_conf.get_val<std::string>("ms_type");

  /* o->td__>pid doesn't set value, so use getpid() instead*/
  auto nonce = o->is_receiver ? 0 : (getpid() + o->td__->thread_number);
  Messenger *msgr = Messenger::create(g_ceph_context, ms_type.c_str(),
				      ename, lname, nonce);
  if (o->is_receiver) {
    msgr->set_default_policy(Messenger::Policy::stateless_server(0));
    msgr->bind(hostname_to_addr(o));
  } else {
    msgr->set_default_policy(Messenger::Policy::lossless_client(0));
  }
  msgr->set_auth_client(g_dummy_auth);
  msgr->set_auth_server(g_dummy_auth);
  msgr->set_require_authorizer(false);
  msgr->start();

  return msgr;
}

static Messenger *single_msgr;
static std::atomic<int> single_msgr_ref;
static vector<FioDispatcher *> single_msgr_disps;

static void init_messenger(struct ceph_msgr_data *data)
{
  struct ceph_msgr_options *o = data->o;
  FioDispatcher *disp;
  Messenger *msgr;

  disp = new FioDispatcher(data);
  if (o->is_single) {
    /*
     * Single messenger instance for the whole FIO
     */

    if (!single_msgr) {
      msgr = create_messenger(o);
      single_msgr = msgr;
    } else {
      msgr = single_msgr;
    }
    single_msgr_disps.push_back(disp);
    single_msgr_ref++;
  } else {
    /*
     * Messenger instance per FIO thread
     */
    msgr = create_messenger(o);
  }
  msgr->add_dispatcher_head(disp);

  data->disp = disp;
  data->msgr = msgr;
}

static void free_messenger(struct ceph_msgr_data *data)
{
  data->msgr->shutdown();
  data->msgr->wait();
  delete data->msgr;
}

static void put_messenger(struct ceph_msgr_data *data)
{
  struct ceph_msgr_options *o = data->o;

  if (o->is_single) {
    if (--single_msgr_ref == 0) {
      free_messenger(data);
      /*
       * In case of a single messenger instance we have to
       * free dispatchers after actual messenger destruction.
       */
      for (auto disp : single_msgr_disps)
	delete disp;
      single_msgr = NULL;
    }
  } else {
    free_messenger(data);
    delete data->disp;
  }
  data->disp = NULL;
  data->msgr = NULL;
}

static int fio_ceph_msgr_setup(struct thread_data *td)
{
  struct ceph_msgr_options *o = (decltype(o))td->eo;
  o->td__ = td;
  ceph_msgr_data *data;

  /* We have to manage global resources so we use threads */
  td->o.use_thread = 1;

  create_or_get_ceph_context(o);

  if (!td->io_ops_data) {
    data = new ceph_msgr_data(o, td->o.iodepth);
    init_messenger(data);
    td->io_ops_data = (void *)data;
  }

  return 0;
}

static void fio_ceph_msgr_cleanup(struct thread_data *td)
{
  struct ceph_msgr_data *data;
  unsigned nr;

  data = (decltype(data))td->io_ops_data;
  put_messenger(data);

  nr = ring_buffer_used_size(&data->io_completed_q);
  if (nr)
    fprintf(stderr, "fio: io_completed_nr==%d, but should be zero\n",
	    nr);
  if (data->io_inflight_nr)
    fprintf(stderr, "fio: io_inflight_nr==%d, but should be zero\n",
	    data->io_inflight_nr);
  if (data->io_pending_nr)
    fprintf(stderr, "fio: io_pending_nr==%d, but should be zero\n",
	    data->io_pending_nr);
  if (!flist_empty(&data->io_inflight_list))
    fprintf(stderr, "fio: io_inflight_list is not empty\n");
  if (!flist_empty(&data->io_pending_list))
    fprintf(stderr, "fio: io_pending_list is not empty\n");

  ring_buffer_deinit(&data->io_completed_q);
  delete data;
  put_ceph_context();
}

static int fio_ceph_msgr_io_u_init(struct thread_data *td, struct io_u *io_u)
{
  struct ceph_msgr_options *o = (decltype(o))td->eo;
  struct ceph_msgr_io *io;
  MOSDOp *req_msg = NULL;

  io = (decltype(io))malloc(sizeof(*io));
  io->io_u = io_u;
  io->data = (decltype(io->data))td->io_ops_data;

  if (!o->is_receiver) {
    object_t oid(ptr_to_str(io));
    pg_t pgid;
    object_locator_t oloc;
    hobject_t hobj(oid, oloc.key, CEPH_NOSNAP, pgid.ps(),
		   pgid.pool(), oloc.nspace);
    spg_t spgid(pgid);
    entity_inst_t dest(entity_name_t::OSD(0), hostname_to_addr(o));

    Messenger *msgr = io->data->msgr;
    ConnectionRef con = msgr->connect_to(dest.name.type(),
					 entity_addrvec_t(dest.addr));

    req_msg = new MOSDOp(0, 0, hobj, spgid, 0, 0, 0);
    req_msg->set_connection(con);
  }

  io->req_msg = req_msg;
  io_u->engine_data = (void *)io;

  return 0;
}

static void fio_ceph_msgr_io_u_free(struct thread_data *td, struct io_u *io_u)
{
  struct ceph_msgr_io *io;

  io = (decltype(io))io_u->engine_data;
  if (io) {
    io_u->engine_data = NULL;
    if (io->req_msg)
      io->req_msg->put();
    free(io);
  }
}

static enum fio_q_status ceph_msgr_sender_queue(struct thread_data *td,
						struct io_u *io_u)
{
  struct ceph_msgr_data *data;
  struct ceph_msgr_io *io;

  bufferlist buflist = bufferlist::static_from_mem(
    (char *)io_u->buf, io_u->buflen);

  io = (decltype(io))io_u->engine_data;
  data = (decltype(data))td->io_ops_data;

  /* No handy method to clear ops before reusage? Ok */
  io->req_msg->ops.clear();

  /* Here we do not care about direction, always send as write */
  io->req_msg->write(0, io_u->buflen, buflist);
  /* Keep message alive */
  io->req_msg->get();
  io->req_msg->get_connection()->send_message(io->req_msg);

  return FIO_Q_QUEUED;
}

static int fio_ceph_msgr_getevents(struct thread_data *td, unsigned int min,
				   unsigned int max, const struct timespec *ts)
{
  struct ceph_msgr_data *data;
  unsigned int nr;

  data = (decltype(data))td->io_ops_data;

  /*
   * Check io_u.c : if min == 0 -> ts is valid and equal to zero,
   * if min != 0 -> ts is NULL.
   */
  assert(!min ^ !ts);

  nr = ring_buffer_used_size(&data->io_completed_q);
  if (nr >= min)
    /* We got something */
    return min(nr, max);

  /* Here we are only if min != 0 and ts == NULL */
  assert(min && !ts);

  while ((nr = ring_buffer_used_size(&data->io_completed_q)) < min &&
	 !td->terminate) {
    /* Poll, no disk IO, so we expect response immediately. */
    usleep(10);
  }

  return min(nr, max);
}

static struct io_u *fio_ceph_msgr_event(struct thread_data *td, int event)
{
  struct ceph_msgr_data *data;
  struct ceph_msgr_io *io;

  data = (decltype(data))td->io_ops_data;
  io = (decltype(io))ring_buffer_dequeue(&data->io_completed_q);

  return io->io_u;
}

static enum fio_q_status ceph_msgr_receiver_queue(struct thread_data *td,
						  struct io_u *io_u)
{
  struct ceph_msgr_data *data;
  struct ceph_msgr_io *io;

  io = (decltype(io))io_u->engine_data;
  data = io->data;
  pthread_spin_lock(&data->spin);
  if (data->io_pending_nr) {
    struct ceph_msgr_reply_io *rep_io;
    MOSDOpReply *rep;

    data->io_pending_nr--;
    rep_io = flist_first_entry(&data->io_pending_list,
			       struct ceph_msgr_reply_io,
			       list);
    flist_del(&rep_io->list);
    rep = rep_io->rep;
    pthread_spin_unlock(&data->spin);
    free(rep_io);

    rep->set_completion_hook(new ReplyCompletion(rep, io));
    rep->get_connection()->send_message(rep);
  } else {
    data->io_inflight_nr++;
    flist_add_tail(&io->list, &data->io_inflight_list);
    pthread_spin_unlock(&data->spin);
  }

  return FIO_Q_QUEUED;
}

static enum fio_q_status fio_ceph_msgr_queue(struct thread_data *td,
					     struct io_u *io_u)
{
  struct ceph_msgr_options *o = (decltype(o))td->eo;

  if (o->is_receiver)
    return ceph_msgr_receiver_queue(td, io_u);
  else
    return ceph_msgr_sender_queue(td, io_u);
}

static int fio_ceph_msgr_open_file(struct thread_data *td, struct fio_file *f)
{
  return 0;
}

static int fio_ceph_msgr_close_file(struct thread_data *, struct fio_file *)
{
  return 0;
}

template <class Func>
fio_option make_option(Func&& func)
{
  auto o = fio_option{};
  o.category = FIO_OPT_C_ENGINE;
  func(std::ref(o));
  return o;
}

static std::vector<fio_option> options {
  make_option([] (fio_option& o) {
    o.name  = "receiver";
    o.lname = "CEPH messenger is receiver";
    o.type  = FIO_OPT_BOOL;
    o.off1  = offsetof(struct ceph_msgr_options, is_receiver);
    o.help  = "CEPH messenger is sender or receiver";
    o.def   = "0";
  }),
  make_option([] (fio_option& o) {
    o.name  = "single_instance";
    o.lname = "Single instance of CEPH messenger ";
    o.type  = FIO_OPT_BOOL;
    o.off1  = offsetof(struct ceph_msgr_options, is_single);
    o.help  = "CEPH messenger is a created once for all threads";
    o.def   = "0";
  }),
  make_option([] (fio_option& o) {
    o.name  = "hostname";
    o.lname = "CEPH messenger hostname";
    o.type  = FIO_OPT_STR_STORE;
    o.off1  = offsetof(struct ceph_msgr_options, hostname);
    o.help  = "Hostname for CEPH messenger engine";
  }),
  make_option([] (fio_option& o) {
    o.name   = "port";
    o.lname  = "CEPH messenger engine port";
    o.type   = FIO_OPT_INT;
    o.off1   = offsetof(struct ceph_msgr_options, port);
    o.maxval = 65535;
    o.minval = 1;
    o.help   = "Port to use for CEPH messenger";
  }),
  make_option([] (fio_option& o) {
    o.name  = "ms_type";
    o.lname = "CEPH messenger transport type: async+posix, async+dpdk, async+rdma";
    o.type  = FIO_OPT_STR;
    o.off1  = offsetof(struct ceph_msgr_options, ms_type);
    o.help  = "Transport type for CEPH messenger, see 'ms async transport type' corresponding CEPH documentation page";
    o.def   = "undef";

    o.posval[0].ival = "undef";
    o.posval[0].oval = CEPH_MSGR_TYPE_UNDEF;

    o.posval[1].ival = "async+posix";
    o.posval[1].oval = CEPH_MSGR_TYPE_POSIX;
    o.posval[1].help = "POSIX API";

    o.posval[2].ival = "async+dpdk";
    o.posval[2].oval = CEPH_MSGR_TYPE_DPDK;
    o.posval[2].help = "DPDK";

    o.posval[3].ival = "async+rdma";
    o.posval[3].oval = CEPH_MSGR_TYPE_RDMA;
    o.posval[3].help = "RDMA";
  }),
  make_option([] (fio_option& o) {
    o.name  = "ceph_conf_file";
    o.lname = "CEPH configuration file";
    o.type  = FIO_OPT_STR_STORE;
    o.off1  = offsetof(struct ceph_msgr_options, conffile);
    o.help  = "Path to CEPH configuration file";
  }),
  {} /* Last NULL */
};

static struct ioengine_ops ioengine;

extern "C" {

void get_ioengine(struct ioengine_ops** ioengine_ptr)
{
  /*
   * Main ioengine structure
   */
  ioengine.name	= "ceph-msgr";
  ioengine.version	= FIO_IOOPS_VERSION;
  ioengine.flags	= FIO_DISKLESSIO | FIO_UNIDIR | FIO_PIPEIO;
  ioengine.setup	= fio_ceph_msgr_setup;
  ioengine.queue	= fio_ceph_msgr_queue;
  ioengine.getevents	= fio_ceph_msgr_getevents;
  ioengine.event	= fio_ceph_msgr_event;
  ioengine.cleanup	= fio_ceph_msgr_cleanup;
  ioengine.open_file	= fio_ceph_msgr_open_file;
  ioengine.close_file	= fio_ceph_msgr_close_file;
  ioengine.io_u_init	= fio_ceph_msgr_io_u_init;
  ioengine.io_u_free	= fio_ceph_msgr_io_u_free;
  ioengine.option_struct_size = sizeof(struct ceph_msgr_options);
  ioengine.options	= options.data();

  *ioengine_ptr = &ioengine;
}
} // extern "C"