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.
21 static LIST_HEAD(engine_list);
23 static int check_engine_ops(struct ioengine_ops *ops)
25 if (ops->version != FIO_IOOPS_VERSION) {
26 log_err("bad ioops version %d (want %d)\n", ops->version,
32 log_err("%s: no queue handler\n", ops->name);
37 * sync engines only need a ->queue()
39 if (ops->flags & FIO_SYNCIO)
43 log_err("%s: no event handler\n", ops->name);
46 if (!ops->getevents) {
47 log_err("%s: no getevents handler\n", ops->name);
51 log_err("%s: no queue handler\n", ops->name);
58 void unregister_ioengine(struct ioengine_ops *ops)
60 dprint(FD_IO, "ioengine %s unregistered\n", ops->name);
62 INIT_LIST_HEAD(&ops->list);
65 void register_ioengine(struct ioengine_ops *ops)
67 dprint(FD_IO, "ioengine %s registered\n", ops->name);
68 INIT_LIST_HEAD(&ops->list);
69 list_add_tail(&ops->list, &engine_list);
72 static struct ioengine_ops *find_ioengine(const char *name)
74 struct ioengine_ops *ops;
75 struct list_head *entry;
77 list_for_each(entry, &engine_list) {
78 ops = list_entry(entry, struct ioengine_ops, list);
79 if (!strcmp(name, ops->name))
86 static struct ioengine_ops *dlopen_ioengine(struct thread_data *td,
87 const char *engine_lib)
89 struct ioengine_ops *ops;
92 dprint(FD_IO, "dload engine %s\n", engine_lib);
95 dlhandle = dlopen(engine_lib, RTLD_LAZY);
97 td_vmsg(td, -1, dlerror(), "dlopen");
102 * Unlike the included modules, external engines should have a
103 * non-static ioengine structure that we can reference.
105 ops = dlsym(dlhandle, "ioengine");
107 td_vmsg(td, -1, dlerror(), "dlsym");
112 ops->dlhandle = dlhandle;
116 struct ioengine_ops *load_ioengine(struct thread_data *td, const char *name)
118 struct ioengine_ops *ops, *ret;
121 dprint(FD_IO, "load ioengine %s\n", name);
123 strncpy(engine, name, sizeof(engine) - 1);
126 * linux libaio has alias names, so convert to what we want
128 if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
129 strcpy(engine, "libaio");
131 ops = find_ioengine(engine);
133 ops = dlopen_ioengine(td, name);
136 log_err("fio: engine %s not loadable\n", name);
141 * Check that the required methods are there.
143 if (check_engine_ops(ops))
146 ret = malloc(sizeof(*ret));
147 memcpy(ret, ops, sizeof(*ret));
153 void close_ioengine(struct thread_data *td)
155 dprint(FD_IO, "close ioengine %s\n", td->io_ops->name);
157 if (td->io_ops->cleanup)
158 td->io_ops->cleanup(td);
160 if (td->io_ops->dlhandle)
161 dlclose(td->io_ops->dlhandle);
167 int td_io_prep(struct thread_data *td, struct io_u *io_u)
169 dprint_io_u(io_u, "prep");
170 fio_ro_check(td, io_u);
172 lock_file(td, io_u->file, io_u->ddir);
174 if (td->io_ops->prep) {
175 int ret = td->io_ops->prep(td, io_u);
177 dprint(FD_IO, "->prep(%p)=%d\n", io_u, ret);
179 unlock_file(td, io_u->file);
186 int td_io_getevents(struct thread_data *td, unsigned int min, unsigned int max,
191 if (min > 0 && td->io_ops->commit) {
192 r = td->io_ops->commit(td);
198 if (td->io_ops->getevents)
199 r = td->io_ops->getevents(td, min, max, t);
201 dprint(FD_IO, "getevents: %d\n", r);
205 int td_io_queue(struct thread_data *td, struct io_u *io_u)
209 dprint_io_u(io_u, "queue");
210 fio_ro_check(td, io_u);
212 assert((io_u->flags & IO_U_F_FLIGHT) == 0);
213 io_u->flags |= IO_U_F_FLIGHT;
215 assert(io_u->file->flags & FIO_FILE_OPEN);
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));
226 * for a sync engine, set the timeout upfront
228 if (mtime_since(&td->timeout_end, &io_u->issue_time)
230 io_u_set_timeout(td);
233 if (io_u->ddir != DDIR_SYNC)
234 td->io_issues[io_u->ddir]++;
236 ret = td->io_ops->queue(td, io_u);
238 unlock_file(td, io_u->file);
240 if (ret != FIO_Q_BUSY)
241 io_u_mark_depth(td, io_u);
243 if (ret == FIO_Q_QUEUED) {
247 if (td->io_u_queued > td->o.iodepth_batch) {
248 r = td_io_commit(td);
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));
260 * async engine, set the timeout here
262 if (ret == FIO_Q_QUEUED &&
263 (mtime_since(&td->timeout_end, &io_u->issue_time)
265 io_u_set_timeout(td);
272 int td_io_init(struct thread_data *td)
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");
287 int td_io_commit(struct thread_data *td)
289 dprint(FD_IO, "calling ->commit(), depth %d\n", td->cur_depth);
295 if (td->io_ops->commit)
296 return td->io_ops->commit(td);
301 int td_io_open_file(struct thread_data *td, struct fio_file *f)
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,
315 if (f->filetype == FIO_TYPE_PIPE) {
317 log_err("fio: can't seek on pipes (no random io)\n");
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;
327 if (td->io_ops->flags & FIO_DISKLESSIO)
330 if (td->o.invalidate_cache && file_invalidate_cache(td, f))
333 if (td->o.fadvise_hint &&
334 (f->filetype == FIO_TYPE_BD || f->filetype == FIO_TYPE_FILE)) {
338 flags = POSIX_FADV_RANDOM;
340 flags = POSIX_FADV_SEQUENTIAL;
342 if (fadvise(f->fd, f->file_offset, f->io_size, flags) < 0) {
343 td_verror(td, errno, "fadvise");
349 memset(f->file_map, 0, f->num_maps * sizeof(long));
352 log_file(td, f, FIO_LOG_OPEN_FILE);
357 if (td->io_ops->close_file)
358 td->io_ops->close_file(td, f);
362 int td_io_close_file(struct thread_data *td, struct fio_file *f)
364 if (!(f->flags & FIO_FILE_CLOSING))
365 log_file(td, f, FIO_LOG_CLOSE_FILE);
368 * mark as closing, do real close when last io on it has completed
370 f->flags |= FIO_FILE_CLOSING;
372 unlock_file_all(td, f);
374 return put_file(td, f);