2 * native linux aio io engine
14 #ifdef FIO_HAVE_LIBAIO
16 #define ev_to_iou(ev) (struct io_u *) ((unsigned long) (ev)->obj)
20 struct io_event *aio_events;
26 static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u)
28 struct fio_file *f = io_u->file;
30 if (io_u->ddir == DDIR_READ)
31 io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
32 else if (io_u->ddir == DDIR_WRITE)
33 io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
34 else if (io_u->ddir == DDIR_SYNC)
35 io_prep_fsync(&io_u->iocb, f->fd);
42 static struct io_u *fio_libaio_event(struct thread_data *td, int event)
44 struct libaio_data *ld = td->io_ops->data;
48 ev = ld->aio_events + event;
51 if (ev->res != io_u->xfer_buflen) {
52 if (ev->res > io_u->xfer_buflen)
53 io_u->error = -ev->res;
55 io_u->resid = io_u->xfer_buflen - ev->res;
62 static int fio_libaio_getevents(struct thread_data *td, int min, int max,
65 struct libaio_data *ld = td->io_ops->data;
69 r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t);
72 else if (r == -EAGAIN) {
75 } else if (r == -EINTR)
84 static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u)
86 struct libaio_data *ld = td->io_ops->data;
88 if (ld->iocbs_nr == (int) td->iodepth)
92 * fsync is tricky, since it can fail and we need to do it
93 * serialized with other io. the reason is that linux doesn't
94 * support aio fsync yet. So return busy for the case where we
95 * have pending io, to let fio complete those first.
97 if (io_u->ddir == DDIR_SYNC) {
100 if (fsync(io_u->file->fd) < 0)
103 return FIO_Q_COMPLETED;
106 ld->iocbs[ld->iocbs_nr] = &io_u->iocb;
107 ld->io_us[ld->iocbs_nr] = io_u;
112 static void fio_libaio_queued(struct thread_data *td, struct io_u **io_us,
118 fio_gettime(&now, NULL);
120 for (i = 0; i < nr; i++) {
121 struct io_u *io_u = io_us[i];
123 memcpy(&io_u->issue_time, &now, sizeof(now));
124 io_u_queued(td, io_u);
128 static int fio_libaio_commit(struct thread_data *td)
130 struct libaio_data *ld = td->io_ops->data;
138 iocbs_nr = ld->iocbs_nr;
142 ret = io_submit(ld->aio_ctx, iocbs_nr, iocbs);
143 if (ret == iocbs_nr) {
144 fio_libaio_queued(td, io_us, ret);
147 } else if (ret > 0) {
148 fio_libaio_queued(td, io_us, ret);
153 } else if (ret == -EAGAIN || !ret)
155 else if (ret == -EINTR)
167 static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u)
169 struct libaio_data *ld = td->io_ops->data;
171 return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events);
174 static void fio_libaio_cleanup(struct thread_data *td)
176 struct libaio_data *ld = td->io_ops->data;
179 io_destroy(ld->aio_ctx);
180 free(ld->aio_events);
184 td->io_ops->data = NULL;
188 static int fio_libaio_init(struct thread_data *td)
190 struct libaio_data *ld = malloc(sizeof(*ld));
192 memset(ld, 0, sizeof(*ld));
193 if (io_queue_init(td->iodepth, &ld->aio_ctx)) {
194 td_verror(td, errno, "io_queue_init");
199 ld->aio_events = malloc(td->iodepth * sizeof(struct io_event));
200 memset(ld->aio_events, 0, td->iodepth * sizeof(struct io_event));
201 ld->iocbs = malloc(td->iodepth * sizeof(struct iocb *));
202 memset(ld->iocbs, 0, sizeof(struct iocb *));
203 ld->io_us = malloc(td->iodepth * sizeof(struct io_u *));
204 memset(ld->io_us, 0, td->iodepth * sizeof(struct io_u *));
207 td->io_ops->data = ld;
211 static struct ioengine_ops ioengine = {
213 .version = FIO_IOOPS_VERSION,
214 .init = fio_libaio_init,
215 .prep = fio_libaio_prep,
216 .queue = fio_libaio_queue,
217 .commit = fio_libaio_commit,
218 .cancel = fio_libaio_cancel,
219 .getevents = fio_libaio_getevents,
220 .event = fio_libaio_event,
221 .cleanup = fio_libaio_cleanup,
222 .open_file = generic_open_file,
223 .close_file = generic_close_file,
226 #else /* FIO_HAVE_LIBAIO */
229 * When we have a proper configure system in place, we simply wont build
230 * and install this io engine. For now install a crippled version that
231 * just complains and fails to load.
233 static int fio_libaio_init(struct thread_data fio_unused *td)
235 fprintf(stderr, "fio: libaio not available\n");
239 static struct ioengine_ops ioengine = {
241 .version = FIO_IOOPS_VERSION,
242 .init = fio_libaio_init,
247 static void fio_init fio_libaio_register(void)
249 register_ioengine(&ioengine);
252 static void fio_exit fio_libaio_unregister(void)
254 unregister_ioengine(&ioengine);