| 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 <fcntl.h> |
| 18 | #include <assert.h> |
| 19 | |
| 20 | #include "fio.h" |
| 21 | #include "diskutil.h" |
| 22 | |
| 23 | static FLIST_HEAD(engine_list); |
| 24 | |
| 25 | static bool check_engine_ops(struct ioengine_ops *ops) |
| 26 | { |
| 27 | if (ops->version != FIO_IOOPS_VERSION) { |
| 28 | log_err("bad ioops version %d (want %d)\n", ops->version, |
| 29 | FIO_IOOPS_VERSION); |
| 30 | return true; |
| 31 | } |
| 32 | |
| 33 | if (!ops->queue) { |
| 34 | log_err("%s: no queue handler\n", ops->name); |
| 35 | return true; |
| 36 | } |
| 37 | |
| 38 | /* |
| 39 | * sync engines only need a ->queue() |
| 40 | */ |
| 41 | if (ops->flags & FIO_SYNCIO) |
| 42 | return false; |
| 43 | |
| 44 | if (!ops->event || !ops->getevents) { |
| 45 | log_err("%s: no event/getevents handler\n", ops->name); |
| 46 | return true; |
| 47 | } |
| 48 | |
| 49 | return false; |
| 50 | } |
| 51 | |
| 52 | void unregister_ioengine(struct ioengine_ops *ops) |
| 53 | { |
| 54 | dprint(FD_IO, "ioengine %s unregistered\n", ops->name); |
| 55 | flist_del(&ops->list); |
| 56 | INIT_FLIST_HEAD(&ops->list); |
| 57 | } |
| 58 | |
| 59 | void register_ioengine(struct ioengine_ops *ops) |
| 60 | { |
| 61 | dprint(FD_IO, "ioengine %s registered\n", ops->name); |
| 62 | INIT_FLIST_HEAD(&ops->list); |
| 63 | flist_add_tail(&ops->list, &engine_list); |
| 64 | } |
| 65 | |
| 66 | static struct ioengine_ops *find_ioengine(const char *name) |
| 67 | { |
| 68 | struct ioengine_ops *ops; |
| 69 | struct flist_head *entry; |
| 70 | |
| 71 | flist_for_each(entry, &engine_list) { |
| 72 | ops = flist_entry(entry, struct ioengine_ops, list); |
| 73 | if (!strcmp(name, ops->name)) |
| 74 | return ops; |
| 75 | } |
| 76 | |
| 77 | return NULL; |
| 78 | } |
| 79 | |
| 80 | static struct ioengine_ops *dlopen_ioengine(struct thread_data *td, |
| 81 | const char *engine_lib) |
| 82 | { |
| 83 | struct ioengine_ops *ops; |
| 84 | void *dlhandle; |
| 85 | |
| 86 | dprint(FD_IO, "dload engine %s\n", engine_lib); |
| 87 | |
| 88 | dlerror(); |
| 89 | dlhandle = dlopen(engine_lib, RTLD_LAZY); |
| 90 | if (!dlhandle) { |
| 91 | td_vmsg(td, -1, dlerror(), "dlopen"); |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * Unlike the included modules, external engines should have a |
| 97 | * non-static ioengine structure that we can reference. |
| 98 | */ |
| 99 | ops = dlsym(dlhandle, engine_lib); |
| 100 | if (!ops) |
| 101 | ops = dlsym(dlhandle, "ioengine"); |
| 102 | |
| 103 | /* |
| 104 | * For some external engines (like C++ ones) it is not that trivial |
| 105 | * to provide a non-static ionengine structure that we can reference. |
| 106 | * Instead we call a method which allocates the required ioengine |
| 107 | * structure. |
| 108 | */ |
| 109 | if (!ops) { |
| 110 | get_ioengine_t get_ioengine = dlsym(dlhandle, "get_ioengine"); |
| 111 | |
| 112 | if (get_ioengine) |
| 113 | get_ioengine(&ops); |
| 114 | } |
| 115 | |
| 116 | if (!ops) { |
| 117 | td_vmsg(td, -1, dlerror(), "dlsym"); |
| 118 | dlclose(dlhandle); |
| 119 | return NULL; |
| 120 | } |
| 121 | |
| 122 | td->io_ops_dlhandle = dlhandle; |
| 123 | return ops; |
| 124 | } |
| 125 | |
| 126 | static struct ioengine_ops *__load_ioengine(const char *name) |
| 127 | { |
| 128 | char engine[64]; |
| 129 | |
| 130 | engine[sizeof(engine) - 1] = '\0'; |
| 131 | strncpy(engine, name, sizeof(engine) - 1); |
| 132 | |
| 133 | /* |
| 134 | * linux libaio has alias names, so convert to what we want |
| 135 | */ |
| 136 | if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3)) { |
| 137 | dprint(FD_IO, "converting ioengine name: %s -> libaio\n", name); |
| 138 | strcpy(engine, "libaio"); |
| 139 | } |
| 140 | |
| 141 | dprint(FD_IO, "load ioengine %s\n", engine); |
| 142 | return find_ioengine(engine); |
| 143 | } |
| 144 | |
| 145 | struct ioengine_ops *load_ioengine(struct thread_data *td) |
| 146 | { |
| 147 | struct ioengine_ops *ops = NULL; |
| 148 | const char *name; |
| 149 | |
| 150 | /* |
| 151 | * Use ->ioengine_so_path if an external ioengine path is specified. |
| 152 | * In this case, ->ioengine is "external" which also means the prefix |
| 153 | * for external ioengines "external:" is properly used. |
| 154 | */ |
| 155 | name = td->o.ioengine_so_path ?: td->o.ioengine; |
| 156 | |
| 157 | /* |
| 158 | * Try to load ->ioengine first, and if failed try to dlopen(3) either |
| 159 | * ->ioengine or ->ioengine_so_path. This is redundant for an external |
| 160 | * ioengine with prefix, and also leaves the possibility of unexpected |
| 161 | * behavior (e.g. if the "external" ioengine exists), but we do this |
| 162 | * so as not to break job files not using the prefix. |
| 163 | */ |
| 164 | ops = __load_ioengine(td->o.ioengine); |
| 165 | if (!ops) |
| 166 | ops = dlopen_ioengine(td, name); |
| 167 | |
| 168 | /* |
| 169 | * If ops is NULL, we failed to load ->ioengine, and also failed to |
| 170 | * dlopen(3) either ->ioengine or ->ioengine_so_path as a path. |
| 171 | */ |
| 172 | if (!ops) { |
| 173 | log_err("fio: engine %s not loadable\n", name); |
| 174 | return NULL; |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Check that the required methods are there. |
| 179 | */ |
| 180 | if (check_engine_ops(ops)) |
| 181 | return NULL; |
| 182 | |
| 183 | return ops; |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * For cleaning up an ioengine which never made it to init(). |
| 188 | */ |
| 189 | void free_ioengine(struct thread_data *td) |
| 190 | { |
| 191 | dprint(FD_IO, "free ioengine %s\n", td->io_ops->name); |
| 192 | |
| 193 | if (td->eo && td->io_ops->options) { |
| 194 | options_free(td->io_ops->options, td->eo); |
| 195 | free(td->eo); |
| 196 | td->eo = NULL; |
| 197 | } |
| 198 | |
| 199 | if (td->io_ops_dlhandle) |
| 200 | dlclose(td->io_ops_dlhandle); |
| 201 | |
| 202 | td->io_ops = NULL; |
| 203 | } |
| 204 | |
| 205 | void close_ioengine(struct thread_data *td) |
| 206 | { |
| 207 | dprint(FD_IO, "close ioengine %s\n", td->io_ops->name); |
| 208 | |
| 209 | if (td->io_ops->cleanup) { |
| 210 | td->io_ops->cleanup(td); |
| 211 | td->io_ops_data = NULL; |
| 212 | } |
| 213 | |
| 214 | free_ioengine(td); |
| 215 | } |
| 216 | |
| 217 | int td_io_prep(struct thread_data *td, struct io_u *io_u) |
| 218 | { |
| 219 | dprint_io_u(io_u, "prep"); |
| 220 | fio_ro_check(td, io_u); |
| 221 | |
| 222 | lock_file(td, io_u->file, io_u->ddir); |
| 223 | |
| 224 | if (td->io_ops->prep) { |
| 225 | int ret = td->io_ops->prep(td, io_u); |
| 226 | |
| 227 | dprint(FD_IO, "->prep(%p)=%d\n", io_u, ret); |
| 228 | if (ret) |
| 229 | unlock_file(td, io_u->file); |
| 230 | return ret; |
| 231 | } |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | int td_io_getevents(struct thread_data *td, unsigned int min, unsigned int max, |
| 237 | const struct timespec *t) |
| 238 | { |
| 239 | int r = 0; |
| 240 | |
| 241 | /* |
| 242 | * For ioengine=rdma one side operation RDMA_WRITE or RDMA_READ, |
| 243 | * server side gets a message from the client |
| 244 | * side that the task is finished, and |
| 245 | * td->done is set to 1 after td_io_commit(). In this case, |
| 246 | * there is no need to reap complete event in server side. |
| 247 | */ |
| 248 | if (td->done) |
| 249 | return 0; |
| 250 | |
| 251 | if (min > 0 && td->io_ops->commit) { |
| 252 | r = td->io_ops->commit(td); |
| 253 | if (r < 0) |
| 254 | goto out; |
| 255 | } |
| 256 | if (max > td->cur_depth) |
| 257 | max = td->cur_depth; |
| 258 | if (min > max) |
| 259 | max = min; |
| 260 | |
| 261 | r = 0; |
| 262 | if (max && td->io_ops->getevents) |
| 263 | r = td->io_ops->getevents(td, min, max, t); |
| 264 | out: |
| 265 | if (r >= 0) { |
| 266 | /* |
| 267 | * Reflect that our submitted requests were retrieved with |
| 268 | * whatever OS async calls are in the underlying engine. |
| 269 | */ |
| 270 | td->io_u_in_flight -= r; |
| 271 | io_u_mark_complete(td, r); |
| 272 | } else |
| 273 | td_verror(td, r, "get_events"); |
| 274 | |
| 275 | dprint(FD_IO, "getevents: %d\n", r); |
| 276 | return r; |
| 277 | } |
| 278 | |
| 279 | int td_io_queue(struct thread_data *td, struct io_u *io_u) |
| 280 | { |
| 281 | const enum fio_ddir ddir = acct_ddir(io_u); |
| 282 | unsigned long buflen = io_u->xfer_buflen; |
| 283 | int ret; |
| 284 | |
| 285 | dprint_io_u(io_u, "queue"); |
| 286 | fio_ro_check(td, io_u); |
| 287 | |
| 288 | assert((io_u->flags & IO_U_F_FLIGHT) == 0); |
| 289 | io_u_set(td, io_u, IO_U_F_FLIGHT); |
| 290 | |
| 291 | assert(fio_file_open(io_u->file)); |
| 292 | |
| 293 | /* |
| 294 | * If using a write iolog, store this entry. |
| 295 | */ |
| 296 | log_io_u(td, io_u); |
| 297 | |
| 298 | io_u->error = 0; |
| 299 | io_u->resid = 0; |
| 300 | |
| 301 | if (td_ioengine_flagged(td, FIO_SYNCIO)) { |
| 302 | if (fio_fill_issue_time(td)) |
| 303 | fio_gettime(&io_u->issue_time, NULL); |
| 304 | |
| 305 | /* |
| 306 | * only used for iolog |
| 307 | */ |
| 308 | if (td->o.read_iolog_file) |
| 309 | memcpy(&td->last_issue, &io_u->issue_time, |
| 310 | sizeof(io_u->issue_time)); |
| 311 | } |
| 312 | |
| 313 | if (ddir_rw(ddir)) { |
| 314 | td->io_issues[ddir]++; |
| 315 | td->io_issue_bytes[ddir] += buflen; |
| 316 | td->rate_io_issue_bytes[ddir] += buflen; |
| 317 | } |
| 318 | |
| 319 | ret = td->io_ops->queue(td, io_u); |
| 320 | |
| 321 | unlock_file(td, io_u->file); |
| 322 | |
| 323 | if (ret == FIO_Q_BUSY && ddir_rw(ddir)) { |
| 324 | td->io_issues[ddir]--; |
| 325 | td->io_issue_bytes[ddir] -= buflen; |
| 326 | td->rate_io_issue_bytes[ddir] -= buflen; |
| 327 | io_u_clear(td, io_u, IO_U_F_FLIGHT); |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * If an error was seen and the io engine didn't propagate it |
| 332 | * back to 'td', do so. |
| 333 | */ |
| 334 | if (io_u->error && !td->error) |
| 335 | td_verror(td, io_u->error, "td_io_queue"); |
| 336 | |
| 337 | /* |
| 338 | * Add warning for O_DIRECT so that users have an easier time |
| 339 | * spotting potentially bad alignment. If this triggers for the first |
| 340 | * IO, then it's likely an alignment problem or because the host fs |
| 341 | * does not support O_DIRECT |
| 342 | */ |
| 343 | if (io_u->error == EINVAL && td->io_issues[io_u->ddir & 1] == 1 && |
| 344 | td->o.odirect) { |
| 345 | |
| 346 | log_info("fio: first direct IO errored. File system may not " |
| 347 | "support direct IO, or iomem_align= is bad, or " |
| 348 | "invalid block size. Try setting direct=0.\n"); |
| 349 | } |
| 350 | |
| 351 | if (!td->io_ops->commit || io_u->ddir == DDIR_TRIM) { |
| 352 | io_u_mark_submit(td, 1); |
| 353 | io_u_mark_complete(td, 1); |
| 354 | } |
| 355 | |
| 356 | if (ret == FIO_Q_COMPLETED) { |
| 357 | if (ddir_rw(io_u->ddir)) { |
| 358 | io_u_mark_depth(td, 1); |
| 359 | td->ts.total_io_u[io_u->ddir]++; |
| 360 | } |
| 361 | } else if (ret == FIO_Q_QUEUED) { |
| 362 | int r; |
| 363 | |
| 364 | td->io_u_queued++; |
| 365 | |
| 366 | if (ddir_rw(io_u->ddir)) |
| 367 | td->ts.total_io_u[io_u->ddir]++; |
| 368 | |
| 369 | if (td->io_u_queued >= td->o.iodepth_batch) { |
| 370 | r = td_io_commit(td); |
| 371 | if (r < 0) |
| 372 | return r; |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | if (!td_ioengine_flagged(td, FIO_SYNCIO)) { |
| 377 | if (fio_fill_issue_time(td)) |
| 378 | fio_gettime(&io_u->issue_time, NULL); |
| 379 | |
| 380 | /* |
| 381 | * only used for iolog |
| 382 | */ |
| 383 | if (td->o.read_iolog_file) |
| 384 | memcpy(&td->last_issue, &io_u->issue_time, |
| 385 | sizeof(io_u->issue_time)); |
| 386 | } |
| 387 | |
| 388 | return ret; |
| 389 | } |
| 390 | |
| 391 | int td_io_init(struct thread_data *td) |
| 392 | { |
| 393 | int ret = 0; |
| 394 | |
| 395 | if (td->io_ops->init) { |
| 396 | ret = td->io_ops->init(td); |
| 397 | if (ret) |
| 398 | log_err("fio: io engine %s init failed.%s\n", |
| 399 | td->io_ops->name, |
| 400 | td->o.iodepth > 1 ? |
| 401 | " Perhaps try reducing io depth?" : ""); |
| 402 | else |
| 403 | td->io_ops_init = 1; |
| 404 | if (!td->error) |
| 405 | td->error = ret; |
| 406 | } |
| 407 | |
| 408 | return ret; |
| 409 | } |
| 410 | |
| 411 | int td_io_commit(struct thread_data *td) |
| 412 | { |
| 413 | int ret; |
| 414 | |
| 415 | dprint(FD_IO, "calling ->commit(), depth %d\n", td->cur_depth); |
| 416 | |
| 417 | if (!td->cur_depth || !td->io_u_queued) |
| 418 | return 0; |
| 419 | |
| 420 | io_u_mark_depth(td, td->io_u_queued); |
| 421 | |
| 422 | if (td->io_ops->commit) { |
| 423 | ret = td->io_ops->commit(td); |
| 424 | if (ret) |
| 425 | td_verror(td, -ret, "io commit"); |
| 426 | } |
| 427 | |
| 428 | /* |
| 429 | * Reflect that events were submitted as async IO requests. |
| 430 | */ |
| 431 | td->io_u_in_flight += td->io_u_queued; |
| 432 | td->io_u_queued = 0; |
| 433 | |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | int td_io_open_file(struct thread_data *td, struct fio_file *f) |
| 438 | { |
| 439 | assert(!fio_file_open(f)); |
| 440 | assert(f->fd == -1); |
| 441 | assert(td->io_ops->open_file); |
| 442 | |
| 443 | if (td->io_ops->open_file(td, f)) { |
| 444 | if (td->error == EINVAL && td->o.odirect) |
| 445 | log_err("fio: destination does not support O_DIRECT\n"); |
| 446 | if (td->error == EMFILE) { |
| 447 | log_err("fio: try reducing/setting openfiles (failed" |
| 448 | " at %u of %u)\n", td->nr_open_files, |
| 449 | td->o.nr_files); |
| 450 | } |
| 451 | |
| 452 | assert(f->fd == -1); |
| 453 | assert(!fio_file_open(f)); |
| 454 | return 1; |
| 455 | } |
| 456 | |
| 457 | fio_file_reset(td, f); |
| 458 | fio_file_set_open(f); |
| 459 | fio_file_clear_closing(f); |
| 460 | disk_util_inc(f->du); |
| 461 | |
| 462 | td->nr_open_files++; |
| 463 | get_file(f); |
| 464 | |
| 465 | if (f->filetype == FIO_TYPE_PIPE) { |
| 466 | if (td_random(td)) { |
| 467 | log_err("fio: can't seek on pipes (no random io)\n"); |
| 468 | goto err; |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | if (td_ioengine_flagged(td, FIO_DISKLESSIO)) |
| 473 | goto done; |
| 474 | |
| 475 | if (td->o.invalidate_cache && file_invalidate_cache(td, f)) |
| 476 | goto err; |
| 477 | |
| 478 | if (td->o.fadvise_hint != F_ADV_NONE && |
| 479 | (f->filetype == FIO_TYPE_BLOCK || f->filetype == FIO_TYPE_FILE)) { |
| 480 | int flags; |
| 481 | |
| 482 | if (td->o.fadvise_hint == F_ADV_TYPE) { |
| 483 | if (td_random(td)) |
| 484 | flags = POSIX_FADV_RANDOM; |
| 485 | else |
| 486 | flags = POSIX_FADV_SEQUENTIAL; |
| 487 | } else if (td->o.fadvise_hint == F_ADV_RANDOM) |
| 488 | flags = POSIX_FADV_RANDOM; |
| 489 | else if (td->o.fadvise_hint == F_ADV_SEQUENTIAL) |
| 490 | flags = POSIX_FADV_SEQUENTIAL; |
| 491 | else { |
| 492 | log_err("fio: unknown fadvise type %d\n", |
| 493 | td->o.fadvise_hint); |
| 494 | flags = POSIX_FADV_NORMAL; |
| 495 | } |
| 496 | |
| 497 | if (posix_fadvise(f->fd, f->file_offset, f->io_size, flags) < 0) { |
| 498 | td_verror(td, errno, "fadvise"); |
| 499 | goto err; |
| 500 | } |
| 501 | } |
| 502 | #ifdef FIO_HAVE_WRITE_HINT |
| 503 | if (fio_option_is_set(&td->o, write_hint) && |
| 504 | (f->filetype == FIO_TYPE_BLOCK || f->filetype == FIO_TYPE_FILE)) { |
| 505 | uint64_t hint = td->o.write_hint; |
| 506 | int cmd; |
| 507 | |
| 508 | /* |
| 509 | * For direct IO, we just need/want to set the hint on |
| 510 | * the file descriptor. For buffered IO, we need to set |
| 511 | * it on the inode. |
| 512 | */ |
| 513 | if (td->o.odirect) |
| 514 | cmd = F_SET_FILE_RW_HINT; |
| 515 | else |
| 516 | cmd = F_SET_RW_HINT; |
| 517 | |
| 518 | if (fcntl(f->fd, cmd, &hint) < 0) { |
| 519 | td_verror(td, errno, "fcntl write hint"); |
| 520 | goto err; |
| 521 | } |
| 522 | } |
| 523 | #endif |
| 524 | |
| 525 | if (td->o.odirect && !OS_O_DIRECT && fio_set_directio(td, f)) |
| 526 | goto err; |
| 527 | |
| 528 | done: |
| 529 | log_file(td, f, FIO_LOG_OPEN_FILE); |
| 530 | return 0; |
| 531 | err: |
| 532 | disk_util_dec(f->du); |
| 533 | if (td->io_ops->close_file) |
| 534 | td->io_ops->close_file(td, f); |
| 535 | return 1; |
| 536 | } |
| 537 | |
| 538 | int td_io_close_file(struct thread_data *td, struct fio_file *f) |
| 539 | { |
| 540 | if (!fio_file_closing(f)) |
| 541 | log_file(td, f, FIO_LOG_CLOSE_FILE); |
| 542 | |
| 543 | /* |
| 544 | * mark as closing, do real close when last io on it has completed |
| 545 | */ |
| 546 | fio_file_set_closing(f); |
| 547 | |
| 548 | disk_util_dec(f->du); |
| 549 | |
| 550 | if (td->o.file_lock_mode != FILE_LOCK_NONE) |
| 551 | unlock_file_all(td, f); |
| 552 | |
| 553 | return put_file(td, f); |
| 554 | } |
| 555 | |
| 556 | int td_io_unlink_file(struct thread_data *td, struct fio_file *f) |
| 557 | { |
| 558 | if (td->io_ops->unlink_file) |
| 559 | return td->io_ops->unlink_file(td, f); |
| 560 | else { |
| 561 | int ret; |
| 562 | |
| 563 | ret = unlink(f->file_name); |
| 564 | if (ret < 0) |
| 565 | return errno; |
| 566 | |
| 567 | return 0; |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | int td_io_get_file_size(struct thread_data *td, struct fio_file *f) |
| 572 | { |
| 573 | if (!td->io_ops->get_file_size) |
| 574 | return 0; |
| 575 | |
| 576 | return td->io_ops->get_file_size(td, f); |
| 577 | } |
| 578 | |
| 579 | int fio_show_ioengine_help(const char *engine) |
| 580 | { |
| 581 | struct flist_head *entry; |
| 582 | struct ioengine_ops *io_ops; |
| 583 | char *sep; |
| 584 | int ret = 1; |
| 585 | |
| 586 | if (!engine || !*engine) { |
| 587 | log_info("Available IO engines:\n"); |
| 588 | flist_for_each(entry, &engine_list) { |
| 589 | io_ops = flist_entry(entry, struct ioengine_ops, list); |
| 590 | log_info("\t%s\n", io_ops->name); |
| 591 | } |
| 592 | return 0; |
| 593 | } |
| 594 | sep = strchr(engine, ','); |
| 595 | if (sep) { |
| 596 | *sep = 0; |
| 597 | sep++; |
| 598 | } |
| 599 | |
| 600 | io_ops = __load_ioengine(engine); |
| 601 | if (!io_ops) { |
| 602 | log_info("IO engine %s not found\n", engine); |
| 603 | return 1; |
| 604 | } |
| 605 | |
| 606 | if (io_ops->options) |
| 607 | ret = show_cmd_help(io_ops->options, sep); |
| 608 | else |
| 609 | log_info("IO engine %s has no options\n", io_ops->name); |
| 610 | |
| 611 | return ret; |
| 612 | } |