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;
23 static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u)
25 struct fio_file *f = io_u->file;
27 if (io_u->ddir == DDIR_READ)
28 io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
29 else if (io_u->ddir == DDIR_WRITE)
30 io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
31 else if (io_u->ddir == DDIR_SYNC)
32 io_prep_fsync(&io_u->iocb, f->fd);
39 static struct io_u *fio_libaio_event(struct thread_data *td, int event)
41 struct libaio_data *ld = td->io_ops->data;
43 return ev_to_iou(ld->aio_events + event);
46 static int fio_libaio_getevents(struct thread_data *td, int min, int max,
49 struct libaio_data *ld = td->io_ops->data;
53 r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t);
56 else if (r == -EAGAIN) {
59 } 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;
74 struct iocb *iocb = &io_u->iocb;
78 ret = io_submit(ld->aio_ctx, 1, &iocb);
81 else if (ret == -EAGAIN || !ret)
83 else if (ret == -EINTR)
85 else if (ret == -EINVAL && io_u->ddir == DDIR_SYNC) {
87 * the async fsync doesn't currently seem to be
88 * supported, so just fsync if we fail with EINVAL
89 * for a sync. since buffered io is also sync
90 * with libaio (still), we don't have pending
91 * requests to flush first.
93 ret = fsync(io_u->file->fd);
100 io_u->resid = io_u->xfer_buflen;
108 static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u)
110 struct libaio_data *ld = td->io_ops->data;
112 return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events);
115 static void fio_libaio_cleanup(struct thread_data *td)
117 struct libaio_data *ld = td->io_ops->data;
120 io_destroy(ld->aio_ctx);
122 free(ld->aio_events);
125 td->io_ops->data = NULL;
129 static int fio_libaio_init(struct thread_data *td)
131 struct libaio_data *ld = malloc(sizeof(*ld));
133 memset(ld, 0, sizeof(*ld));
134 if (io_queue_init(td->iodepth, &ld->aio_ctx)) {
135 td_verror(td, errno);
140 ld->aio_events = malloc(td->iodepth * sizeof(struct io_event));
141 memset(ld->aio_events, 0, td->iodepth * sizeof(struct io_event));
142 td->io_ops->data = ld;
146 static struct ioengine_ops ioengine = {
148 .version = FIO_IOOPS_VERSION,
149 .init = fio_libaio_init,
150 .prep = fio_libaio_prep,
151 .queue = fio_libaio_queue,
152 .cancel = fio_libaio_cancel,
153 .getevents = fio_libaio_getevents,
154 .event = fio_libaio_event,
155 .cleanup = fio_libaio_cleanup,
158 #else /* FIO_HAVE_LIBAIO */
161 * When we have a proper configure system in place, we simply wont build
162 * and install this io engine. For now install a crippled version that
163 * just complains and fails to load.
165 static int fio_libaio_init(struct thread_data fio_unused *td)
167 fprintf(stderr, "fio: libaio not available\n");
171 static struct ioengine_ops ioengine = {
173 .version = FIO_IOOPS_VERSION,
174 .init = fio_libaio_init,
179 static void fio_init fio_libaio_register(void)
181 register_ioengine(&ioengine);
184 static void fio_exit fio_libaio_unregister(void)
186 unregister_ioengine(&ioengine);