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;
46 return ev_to_iou(ld->aio_events + event);
49 static int fio_libaio_getevents(struct thread_data *td, int min, int max,
52 struct libaio_data *ld = td->io_ops->data;
56 r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t);
59 else if (r == -EAGAIN) {
62 } else if (r == -EINTR)
71 static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u)
73 struct libaio_data *ld = td->io_ops->data;
75 if (ld->iocbs_nr == (int) td->iodepth)
79 * fsync is tricky, since it can fail and we need to do it
80 * serialized with other io. the reason is that linux doesn't
81 * support aio fsync yet. So return busy for the case where we
82 * have pending io, to let fio complete those first.
84 if (io_u->ddir == DDIR_SYNC) {
87 if (fsync(io_u->file->fd) < 0)
90 return FIO_Q_COMPLETED;
93 ld->iocbs[ld->iocbs_nr] = &io_u->iocb;
94 ld->io_us[ld->iocbs_nr] = io_u;
99 static void fio_libaio_queued(struct thread_data *td, struct io_u **io_us,
105 fio_gettime(&now, NULL);
107 for (i = 0; i < nr; i++) {
108 struct io_u *io_u = io_us[i];
110 memcpy(&io_u->issue_time, &now, sizeof(now));
111 io_u_queued(td, io_u);
115 static int fio_libaio_commit(struct thread_data *td)
117 struct libaio_data *ld = td->io_ops->data;
125 iocbs_nr = ld->iocbs_nr;
129 ret = io_submit(ld->aio_ctx, iocbs_nr, iocbs);
130 if (ret == iocbs_nr) {
131 fio_libaio_queued(td, io_us, ret);
134 } else if (ret > 0) {
135 fio_libaio_queued(td, io_us, ret);
140 } else if (ret == -EAGAIN || !ret)
142 else if (ret == -EINTR)
154 static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u)
156 struct libaio_data *ld = td->io_ops->data;
158 return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events);
161 static void fio_libaio_cleanup(struct thread_data *td)
163 struct libaio_data *ld = td->io_ops->data;
166 io_destroy(ld->aio_ctx);
167 free(ld->aio_events);
171 td->io_ops->data = NULL;
175 static int fio_libaio_init(struct thread_data *td)
177 struct libaio_data *ld = malloc(sizeof(*ld));
179 memset(ld, 0, sizeof(*ld));
180 if (io_queue_init(td->iodepth, &ld->aio_ctx)) {
181 td_verror(td, errno, "io_queue_init");
186 ld->aio_events = malloc(td->iodepth * sizeof(struct io_event));
187 memset(ld->aio_events, 0, td->iodepth * sizeof(struct io_event));
188 ld->iocbs = malloc(td->iodepth * sizeof(struct iocb *));
189 memset(ld->iocbs, 0, sizeof(struct iocb *));
190 ld->io_us = malloc(td->iodepth * sizeof(struct io_u *));
191 memset(ld->io_us, 0, td->iodepth * sizeof(struct io_u *));
194 td->io_ops->data = ld;
198 static struct ioengine_ops ioengine = {
200 .version = FIO_IOOPS_VERSION,
201 .init = fio_libaio_init,
202 .prep = fio_libaio_prep,
203 .queue = fio_libaio_queue,
204 .commit = fio_libaio_commit,
205 .cancel = fio_libaio_cancel,
206 .getevents = fio_libaio_getevents,
207 .event = fio_libaio_event,
208 .cleanup = fio_libaio_cleanup,
211 #else /* FIO_HAVE_LIBAIO */
214 * When we have a proper configure system in place, we simply wont build
215 * and install this io engine. For now install a crippled version that
216 * just complains and fails to load.
218 static int fio_libaio_init(struct thread_data fio_unused *td)
220 fprintf(stderr, "fio: libaio not available\n");
224 static struct ioengine_ops ioengine = {
226 .version = FIO_IOOPS_VERSION,
227 .init = fio_libaio_init,
232 static void fio_init fio_libaio_register(void)
234 register_ioengine(&ioengine);
237 static void fio_exit fio_libaio_unregister(void)
239 unregister_ioengine(&ioengine);