4 * IO engine using the Linux native aio interface.
15 #ifdef FIO_HAVE_LIBAIO
17 #define ev_to_iou(ev) (struct io_u *) ((unsigned long) (ev)->obj)
21 struct io_event *aio_events;
27 static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u)
29 struct fio_file *f = io_u->file;
31 if (io_u->ddir == DDIR_READ)
32 io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
33 else if (io_u->ddir == DDIR_WRITE)
34 io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
35 else if (io_u->ddir == DDIR_SYNC)
36 io_prep_fsync(&io_u->iocb, f->fd);
43 static struct io_u *fio_libaio_event(struct thread_data *td, int event)
45 struct libaio_data *ld = td->io_ops->data;
49 ev = ld->aio_events + event;
52 if (ev->res != io_u->xfer_buflen) {
53 if (ev->res > io_u->xfer_buflen)
54 io_u->error = -ev->res;
56 io_u->resid = io_u->xfer_buflen - ev->res;
63 static int fio_libaio_getevents(struct thread_data *td, unsigned int min,
64 unsigned int max, struct timespec *t)
66 struct libaio_data *ld = td->io_ops->data;
70 r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t);
73 else if (r == -EAGAIN) {
76 } else if (r == -EINTR)
85 static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u)
87 struct libaio_data *ld = td->io_ops->data;
89 fio_ro_check(td, io_u);
91 if (ld->iocbs_nr == (int) td->o.iodepth)
95 * fsync is tricky, since it can fail and we need to do it
96 * serialized with other io. the reason is that linux doesn't
97 * support aio fsync yet. So return busy for the case where we
98 * have pending io, to let fio complete those first.
100 if (io_u->ddir == DDIR_SYNC) {
103 if (fsync(io_u->file->fd) < 0)
106 return FIO_Q_COMPLETED;
109 ld->iocbs[ld->iocbs_nr] = &io_u->iocb;
110 ld->io_us[ld->iocbs_nr] = io_u;
115 static void fio_libaio_queued(struct thread_data *td, struct io_u **io_us,
121 fio_gettime(&now, NULL);
123 for (i = 0; i < nr; i++) {
124 struct io_u *io_u = io_us[i];
126 memcpy(&io_u->issue_time, &now, sizeof(now));
127 io_u_queued(td, io_u);
131 static int fio_libaio_commit(struct thread_data *td)
133 struct libaio_data *ld = td->io_ops->data;
144 ret = io_submit(ld->aio_ctx, ld->iocbs_nr, iocbs);
146 fio_libaio_queued(td, io_us, ret);
151 } else if (!ret || ret == -EAGAIN || ret == -EINTR)
155 } while (ld->iocbs_nr);
160 static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u)
162 struct libaio_data *ld = td->io_ops->data;
164 return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events);
167 static void fio_libaio_cleanup(struct thread_data *td)
169 struct libaio_data *ld = td->io_ops->data;
172 io_destroy(ld->aio_ctx);
173 free(ld->aio_events);
177 td->io_ops->data = NULL;
181 static int fio_libaio_init(struct thread_data *td)
183 struct libaio_data *ld = malloc(sizeof(*ld));
184 static int warn_print;
187 if (td->o.iodepth > 1 && !td->o.odirect && !warn_print) {
188 log_info("fio: libaio engine is only async for non-buffered IO\n");
192 memset(ld, 0, sizeof(*ld));
194 err = io_queue_init(td->o.iodepth, &ld->aio_ctx);
196 td_verror(td, -err, "io_queue_init");
197 log_err("fio: check /proc/sys/fs/aio-max-nr\n");
202 ld->aio_events = malloc(td->o.iodepth * sizeof(struct io_event));
203 memset(ld->aio_events, 0, td->o.iodepth * sizeof(struct io_event));
204 ld->iocbs = malloc(td->o.iodepth * sizeof(struct iocb *));
205 memset(ld->iocbs, 0, sizeof(struct iocb *));
206 ld->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
207 memset(ld->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
210 td->io_ops->data = ld;
214 static struct ioengine_ops ioengine = {
216 .version = FIO_IOOPS_VERSION,
217 .init = fio_libaio_init,
218 .prep = fio_libaio_prep,
219 .queue = fio_libaio_queue,
220 .commit = fio_libaio_commit,
221 .cancel = fio_libaio_cancel,
222 .getevents = fio_libaio_getevents,
223 .event = fio_libaio_event,
224 .cleanup = fio_libaio_cleanup,
225 .open_file = generic_open_file,
226 .close_file = generic_close_file,
229 #else /* FIO_HAVE_LIBAIO */
232 * When we have a proper configure system in place, we simply wont build
233 * and install this io engine. For now install a crippled version that
234 * just complains and fails to load.
236 static int fio_libaio_init(struct thread_data fio_unused *td)
238 fprintf(stderr, "fio: libaio not available\n");
242 static struct ioengine_ops ioengine = {
244 .version = FIO_IOOPS_VERSION,
245 .init = fio_libaio_init,
250 static void fio_init fio_libaio_register(void)
252 register_ioengine(&ioengine);
255 static void fio_exit fio_libaio_unregister(void)
257 unregister_ioengine(&ioengine);