4 * IO engine using the Linux native aio interface.
16 #ifdef FIO_HAVE_LIBAIO
18 #define ev_to_iou(ev) (struct io_u *) ((unsigned long) (ev)->obj)
22 struct io_event *aio_events;
28 static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u)
30 struct fio_file *f = io_u->file;
32 if (io_u->ddir == DDIR_READ)
33 io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
34 else if (io_u->ddir == DDIR_WRITE)
35 io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
36 else if (io_u->ddir == DDIR_SYNC)
37 io_prep_fsync(&io_u->iocb, f->fd);
44 static struct io_u *fio_libaio_event(struct thread_data *td, int event)
46 struct libaio_data *ld = td->io_ops->data;
50 ev = ld->aio_events + event;
53 if (ev->res != io_u->xfer_buflen) {
54 if (ev->res > io_u->xfer_buflen)
55 io_u->error = -ev->res;
57 io_u->resid = io_u->xfer_buflen - ev->res;
64 static int fio_libaio_getevents(struct thread_data *td, int min, int max,
67 struct libaio_data *ld = td->io_ops->data;
71 r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t);
74 else if (r == -EAGAIN) {
77 } else if (r == -EINTR)
86 static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u)
88 struct libaio_data *ld = td->io_ops->data;
90 if (ld->iocbs_nr == (int) td->o.iodepth)
94 * fsync is tricky, since it can fail and we need to do it
95 * serialized with other io. the reason is that linux doesn't
96 * support aio fsync yet. So return busy for the case where we
97 * have pending io, to let fio complete those first.
99 if (io_u->ddir == DDIR_SYNC) {
102 if (fsync(io_u->file->fd) < 0)
105 return FIO_Q_COMPLETED;
108 ld->iocbs[ld->iocbs_nr] = &io_u->iocb;
109 ld->io_us[ld->iocbs_nr] = io_u;
114 static void fio_libaio_queued(struct thread_data *td, struct io_u **io_us,
120 fio_gettime(&now, NULL);
122 for (i = 0; i < nr; i++) {
123 struct io_u *io_u = io_us[i];
125 memcpy(&io_u->issue_time, &now, sizeof(now));
126 io_u_queued(td, io_u);
130 static int fio_libaio_commit(struct thread_data *td)
132 struct libaio_data *ld = td->io_ops->data;
140 iocbs_nr = ld->iocbs_nr;
144 ret = io_submit(ld->aio_ctx, iocbs_nr, iocbs);
145 if (ret == iocbs_nr) {
146 fio_libaio_queued(td, io_us, ret);
149 } else if (ret > 0) {
150 fio_libaio_queued(td, io_us, ret);
155 } else if (ret == -EAGAIN || !ret)
157 else if (ret == -EINTR)
169 static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u)
171 struct libaio_data *ld = td->io_ops->data;
173 return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events);
176 static void fio_libaio_cleanup(struct thread_data *td)
178 struct libaio_data *ld = td->io_ops->data;
181 io_destroy(ld->aio_ctx);
182 free(ld->aio_events);
186 td->io_ops->data = NULL;
190 static int fio_libaio_init(struct thread_data *td)
192 struct libaio_data *ld = malloc(sizeof(*ld));
195 memset(ld, 0, sizeof(*ld));
197 err = io_queue_init(td->o.iodepth, &ld->aio_ctx);
199 td_verror(td, -err, "io_queue_init");
204 ld->aio_events = malloc(td->o.iodepth * sizeof(struct io_event));
205 memset(ld->aio_events, 0, td->o.iodepth * sizeof(struct io_event));
206 ld->iocbs = malloc(td->o.iodepth * sizeof(struct iocb *));
207 memset(ld->iocbs, 0, sizeof(struct iocb *));
208 ld->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
209 memset(ld->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
212 td->io_ops->data = ld;
216 static struct ioengine_ops ioengine = {
218 .version = FIO_IOOPS_VERSION,
219 .init = fio_libaio_init,
220 .prep = fio_libaio_prep,
221 .queue = fio_libaio_queue,
222 .commit = fio_libaio_commit,
223 .cancel = fio_libaio_cancel,
224 .getevents = fio_libaio_getevents,
225 .event = fio_libaio_event,
226 .cleanup = fio_libaio_cleanup,
227 .open_file = generic_open_file,
228 .close_file = generic_close_file,
231 #else /* FIO_HAVE_LIBAIO */
234 * When we have a proper configure system in place, we simply wont build
235 * and install this io engine. For now install a crippled version that
236 * just complains and fails to load.
238 static int fio_libaio_init(struct thread_data fio_unused *td)
240 fprintf(stderr, "fio: libaio not available\n");
244 static struct ioengine_ops ioengine = {
246 .version = FIO_IOOPS_VERSION,
247 .init = fio_libaio_init,
252 static void fio_init fio_libaio_register(void)
254 register_ioengine(&ioengine);
257 static void fio_exit fio_libaio_unregister(void)
259 unregister_ioengine(&ioengine);