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;
141 iocbs_nr = ld->iocbs_nr;
145 ret = io_submit(ld->aio_ctx, iocbs_nr, iocbs);
146 if (ret == iocbs_nr) {
147 fio_libaio_queued(td, io_us, ret);
150 } else if (ret > 0) {
151 fio_libaio_queued(td, io_us, ret);
156 } else if (ret == -EAGAIN || !ret)
158 else if (ret == -EINTR)
170 static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u)
172 struct libaio_data *ld = td->io_ops->data;
174 return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events);
177 static void fio_libaio_cleanup(struct thread_data *td)
179 struct libaio_data *ld = td->io_ops->data;
182 io_destroy(ld->aio_ctx);
183 free(ld->aio_events);
187 td->io_ops->data = NULL;
191 static int fio_libaio_init(struct thread_data *td)
193 struct libaio_data *ld = malloc(sizeof(*ld));
194 static int warn_print;
197 if (td->o.iodepth > 1 && !td->o.odirect && !warn_print) {
198 log_info("fio: libaio engine is only async for non-buffered IO\n");
202 memset(ld, 0, sizeof(*ld));
204 err = io_queue_init(td->o.iodepth, &ld->aio_ctx);
206 td_verror(td, -err, "io_queue_init");
211 ld->aio_events = malloc(td->o.iodepth * sizeof(struct io_event));
212 memset(ld->aio_events, 0, td->o.iodepth * sizeof(struct io_event));
213 ld->iocbs = malloc(td->o.iodepth * sizeof(struct iocb *));
214 memset(ld->iocbs, 0, sizeof(struct iocb *));
215 ld->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
216 memset(ld->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
219 td->io_ops->data = ld;
223 static struct ioengine_ops ioengine = {
225 .version = FIO_IOOPS_VERSION,
226 .init = fio_libaio_init,
227 .prep = fio_libaio_prep,
228 .queue = fio_libaio_queue,
229 .commit = fio_libaio_commit,
230 .cancel = fio_libaio_cancel,
231 .getevents = fio_libaio_getevents,
232 .event = fio_libaio_event,
233 .cleanup = fio_libaio_cleanup,
234 .open_file = generic_open_file,
235 .close_file = generic_close_file,
238 #else /* FIO_HAVE_LIBAIO */
241 * When we have a proper configure system in place, we simply wont build
242 * and install this io engine. For now install a crippled version that
243 * just complains and fails to load.
245 static int fio_libaio_init(struct thread_data fio_unused *td)
247 fprintf(stderr, "fio: libaio not available\n");
251 static struct ioengine_ops ioengine = {
253 .version = FIO_IOOPS_VERSION,
254 .init = fio_libaio_init,
259 static void fio_init fio_libaio_register(void)
261 register_ioengine(&ioengine);
264 static void fio_exit fio_libaio_unregister(void)
266 unregister_ioengine(&ioengine);