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.
5 * sync io is implemented on top of aio.
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.
23 static FLIST_HEAD(engine_list);
25 static bool check_engine_ops(struct ioengine_ops *ops)
27 if (ops->version != FIO_IOOPS_VERSION) {
28 log_err("bad ioops version %d (want %d)\n", ops->version,
34 log_err("%s: no queue handler\n", ops->name);
39 * sync engines only need a ->queue()
41 if (ops->flags & FIO_SYNCIO)
44 if (!ops->event || !ops->getevents) {
45 log_err("%s: no event/getevents handler\n", ops->name);
52 void unregister_ioengine(struct ioengine_ops *ops)
54 dprint(FD_IO, "ioengine %s unregistered\n", ops->name);
55 flist_del(&ops->list);
56 INIT_FLIST_HEAD(&ops->list);
59 void register_ioengine(struct ioengine_ops *ops)
61 dprint(FD_IO, "ioengine %s registered\n", ops->name);
62 INIT_FLIST_HEAD(&ops->list);
63 flist_add_tail(&ops->list, &engine_list);
66 static struct ioengine_ops *find_ioengine(const char *name)
68 struct ioengine_ops *ops;
69 struct flist_head *entry;
71 flist_for_each(entry, &engine_list) {
72 ops = flist_entry(entry, struct ioengine_ops, list);
73 if (!strcmp(name, ops->name))
80 static struct ioengine_ops *dlopen_ioengine(struct thread_data *td,
81 const char *engine_lib)
83 struct ioengine_ops *ops;
86 dprint(FD_IO, "dload engine %s\n", engine_lib);
89 dlhandle = dlopen(engine_lib, RTLD_LAZY);
91 td_vmsg(td, -1, dlerror(), "dlopen");
96 * Unlike the included modules, external engines should have a
97 * non-static ioengine structure that we can reference.
99 ops = dlsym(dlhandle, engine_lib);
101 ops = dlsym(dlhandle, "ioengine");
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
110 get_ioengine_t get_ioengine = dlsym(dlhandle, "get_ioengine");
117 td_vmsg(td, -1, dlerror(), "dlsym");
122 td->io_ops_dlhandle = dlhandle;
126 struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name)
128 struct ioengine_ops *ops;
131 dprint(FD_IO, "load ioengine %s\n", name);
133 engine[sizeof(engine) - 1] = '\0';
134 strncpy(engine, name, sizeof(engine) - 1);
137 * linux libaio has alias names, so convert to what we want
139 if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3)) {
140 dprint(FD_IO, "converting ioengine name: %s -> libaio\n", name);
141 strcpy(engine, "libaio");
144 ops = find_ioengine(engine);
146 ops = dlopen_ioengine(td, name);
149 log_err("fio: engine %s not loadable\n", name);
154 * Check that the required methods are there.
156 if (check_engine_ops(ops))
163 * For cleaning up an ioengine which never made it to init().
165 void free_ioengine(struct thread_data *td)
167 dprint(FD_IO, "free ioengine %s\n", td->io_ops->name);
169 if (td->eo && td->io_ops->options) {
170 options_free(td->io_ops->options, td->eo);
175 if (td->io_ops_dlhandle)
176 dlclose(td->io_ops_dlhandle);
181 void close_ioengine(struct thread_data *td)
183 dprint(FD_IO, "close ioengine %s\n", td->io_ops->name);
185 if (td->io_ops->cleanup) {
186 td->io_ops->cleanup(td);
187 td->io_ops_data = NULL;
193 int td_io_prep(struct thread_data *td, struct io_u *io_u)
195 dprint_io_u(io_u, "prep");
196 fio_ro_check(td, io_u);
198 lock_file(td, io_u->file, io_u->ddir);
200 if (td->io_ops->prep) {
201 int ret = td->io_ops->prep(td, io_u);
203 dprint(FD_IO, "->prep(%p)=%d\n", io_u, ret);
205 unlock_file(td, io_u->file);
212 int td_io_getevents(struct thread_data *td, unsigned int min, unsigned int max,
213 const struct timespec *t)
218 * For ioengine=rdma one side operation RDMA_WRITE or RDMA_READ,
219 * server side gets a message from the client
220 * side that the task is finished, and
221 * td->done is set to 1 after td_io_commit(). In this case,
222 * there is no need to reap complete event in server side.
227 if (min > 0 && td->io_ops->commit) {
228 r = td->io_ops->commit(td);
232 if (max > td->cur_depth)
238 if (max && td->io_ops->getevents)
239 r = td->io_ops->getevents(td, min, max, t);
243 * Reflect that our submitted requests were retrieved with
244 * whatever OS async calls are in the underlying engine.
246 td->io_u_in_flight -= r;
247 io_u_mark_complete(td, r);
249 td_verror(td, r, "get_events");
251 dprint(FD_IO, "getevents: %d\n", r);
255 int td_io_queue(struct thread_data *td, struct io_u *io_u)
257 const enum fio_ddir ddir = acct_ddir(io_u);
258 unsigned long buflen = io_u->xfer_buflen;
261 dprint_io_u(io_u, "queue");
262 fio_ro_check(td, io_u);
264 assert((io_u->flags & IO_U_F_FLIGHT) == 0);
265 io_u_set(td, io_u, IO_U_F_FLIGHT);
267 assert(fio_file_open(io_u->file));
270 * If using a write iolog, store this entry.
277 if (td_ioengine_flagged(td, FIO_SYNCIO)) {
278 if (fio_fill_issue_time(td))
279 fio_gettime(&io_u->issue_time, NULL);
282 * only used for iolog
284 if (td->o.read_iolog_file)
285 memcpy(&td->last_issue, &io_u->issue_time,
286 sizeof(struct timeval));
290 td->io_issues[ddir]++;
291 td->io_issue_bytes[ddir] += buflen;
292 td->rate_io_issue_bytes[ddir] += buflen;
295 ret = td->io_ops->queue(td, io_u);
297 unlock_file(td, io_u->file);
299 if (ret == FIO_Q_BUSY && ddir_rw(ddir)) {
300 td->io_issues[ddir]--;
301 td->io_issue_bytes[ddir] -= buflen;
302 td->rate_io_issue_bytes[ddir] -= buflen;
303 io_u_clear(td, io_u, IO_U_F_FLIGHT);
307 * If an error was seen and the io engine didn't propagate it
308 * back to 'td', do so.
310 if (io_u->error && !td->error)
311 td_verror(td, io_u->error, "td_io_queue");
314 * Add warning for O_DIRECT so that users have an easier time
315 * spotting potentially bad alignment. If this triggers for the first
316 * IO, then it's likely an alignment problem or because the host fs
317 * does not support O_DIRECT
319 if (io_u->error == EINVAL && td->io_issues[io_u->ddir & 1] == 1 &&
322 log_info("fio: first direct IO errored. File system may not "
323 "support direct IO, or iomem_align= is bad. Try "
324 "setting direct=0.\n");
327 if (!td->io_ops->commit || io_u->ddir == DDIR_TRIM) {
328 io_u_mark_submit(td, 1);
329 io_u_mark_complete(td, 1);
332 if (ret == FIO_Q_COMPLETED) {
333 if (ddir_rw(io_u->ddir)) {
334 io_u_mark_depth(td, 1);
335 td->ts.total_io_u[io_u->ddir]++;
337 } else if (ret == FIO_Q_QUEUED) {
342 if (ddir_rw(io_u->ddir))
343 td->ts.total_io_u[io_u->ddir]++;
345 if (td->io_u_queued >= td->o.iodepth_batch) {
346 r = td_io_commit(td);
352 if (!td_ioengine_flagged(td, FIO_SYNCIO)) {
353 if (fio_fill_issue_time(td))
354 fio_gettime(&io_u->issue_time, NULL);
357 * only used for iolog
359 if (td->o.read_iolog_file)
360 memcpy(&td->last_issue, &io_u->issue_time,
361 sizeof(struct timeval));
367 int td_io_init(struct thread_data *td)
371 if (td->io_ops->init) {
372 ret = td->io_ops->init(td);
374 log_err("fio: io engine %s init failed.%s\n",
377 " Perhaps try reducing io depth?" : "");
387 int td_io_commit(struct thread_data *td)
391 dprint(FD_IO, "calling ->commit(), depth %d\n", td->cur_depth);
393 if (!td->cur_depth || !td->io_u_queued)
396 io_u_mark_depth(td, td->io_u_queued);
398 if (td->io_ops->commit) {
399 ret = td->io_ops->commit(td);
401 td_verror(td, -ret, "io commit");
405 * Reflect that events were submitted as async IO requests.
407 td->io_u_in_flight += td->io_u_queued;
413 int td_io_open_file(struct thread_data *td, struct fio_file *f)
415 assert(!fio_file_open(f));
417 assert(td->io_ops->open_file);
419 if (td->io_ops->open_file(td, f)) {
420 if (td->error == EINVAL && td->o.odirect)
421 log_err("fio: destination does not support O_DIRECT\n");
422 if (td->error == EMFILE) {
423 log_err("fio: try reducing/setting openfiles (failed"
424 " at %u of %u)\n", td->nr_open_files,
429 assert(!fio_file_open(f));
433 fio_file_reset(td, f);
434 fio_file_set_open(f);
435 fio_file_clear_closing(f);
436 disk_util_inc(f->du);
441 if (f->filetype == FIO_TYPE_PIPE) {
443 log_err("fio: can't seek on pipes (no random io)\n");
448 if (td_ioengine_flagged(td, FIO_DISKLESSIO))
451 if (td->o.invalidate_cache && file_invalidate_cache(td, f))
454 if (td->o.fadvise_hint != F_ADV_NONE &&
455 (f->filetype == FIO_TYPE_BLOCK || f->filetype == FIO_TYPE_FILE)) {
458 if (td->o.fadvise_hint == F_ADV_TYPE) {
460 flags = POSIX_FADV_RANDOM;
462 flags = POSIX_FADV_SEQUENTIAL;
463 } else if (td->o.fadvise_hint == F_ADV_RANDOM)
464 flags = POSIX_FADV_RANDOM;
465 else if (td->o.fadvise_hint == F_ADV_SEQUENTIAL)
466 flags = POSIX_FADV_SEQUENTIAL;
468 log_err("fio: unknown fadvise type %d\n",
470 flags = POSIX_FADV_NORMAL;
473 if (posix_fadvise(f->fd, f->file_offset, f->io_size, flags) < 0) {
474 td_verror(td, errno, "fadvise");
478 #ifdef FIO_HAVE_STREAMID
479 if (td->o.fadvise_stream &&
480 (f->filetype == FIO_TYPE_BLOCK || f->filetype == FIO_TYPE_FILE)) {
481 off_t stream = td->o.fadvise_stream;
483 if (posix_fadvise(f->fd, stream, f->io_size, POSIX_FADV_STREAMID) < 0) {
484 td_verror(td, errno, "fadvise streamid");
490 #ifdef FIO_OS_DIRECTIO
492 * Some OS's have a distinct call to mark the file non-buffered,
493 * instead of using O_DIRECT (Solaris)
496 int ret = fio_set_odirect(f->fd);
499 td_verror(td, ret, "fio_set_odirect");
500 if (ret == ENOTTY) { /* ENOTTY suggests RAW device or ZFS */
501 log_err("fio: doing directIO to RAW devices or ZFS not supported\n");
503 log_err("fio: the file system does not seem to support direct IO\n");
512 log_file(td, f, FIO_LOG_OPEN_FILE);
515 disk_util_dec(f->du);
516 if (td->io_ops->close_file)
517 td->io_ops->close_file(td, f);
521 int td_io_close_file(struct thread_data *td, struct fio_file *f)
523 if (!fio_file_closing(f))
524 log_file(td, f, FIO_LOG_CLOSE_FILE);
527 * mark as closing, do real close when last io on it has completed
529 fio_file_set_closing(f);
531 disk_util_dec(f->du);
533 if (td->o.file_lock_mode != FILE_LOCK_NONE)
534 unlock_file_all(td, f);
536 return put_file(td, f);
539 int td_io_unlink_file(struct thread_data *td, struct fio_file *f)
541 if (td->io_ops->unlink_file)
542 return td->io_ops->unlink_file(td, f);
546 ret = unlink(f->file_name);
554 int td_io_get_file_size(struct thread_data *td, struct fio_file *f)
556 if (!td->io_ops->get_file_size)
559 return td->io_ops->get_file_size(td, f);
562 int fio_show_ioengine_help(const char *engine)
564 struct flist_head *entry;
565 struct thread_data td;
566 struct ioengine_ops *io_ops;
570 if (!engine || !*engine) {
571 log_info("Available IO engines:\n");
572 flist_for_each(entry, &engine_list) {
573 io_ops = flist_entry(entry, struct ioengine_ops, list);
574 log_info("\t%s\n", io_ops->name);
578 sep = strchr(engine, ',');
584 memset(&td, 0, sizeof(td));
586 io_ops = load_ioengine(&td, engine);
588 log_info("IO engine %s not found\n", engine);
593 ret = show_cmd_help(io_ops->options, sep);
595 log_info("IO engine %s has no options\n", io_ops->name);