+ dprint_io_u(io_u, "prep");
+ fio_ro_check(td, io_u);
+
+ lock_file(td, io_u->file, io_u->ddir);
+
+ if (td->io_ops->prep) {
+ int ret = td->io_ops->prep(td, io_u);
+
+ dprint(FD_IO, "->prep(%p)=%d\n", io_u, ret);
+ if (ret)
+ unlock_file(td, io_u->file);
+ return ret;
+ }
+
+ return 0;
+}
+
+int td_io_getevents(struct thread_data *td, unsigned int min, unsigned int max,
+ struct timespec *t)
+{
+ int r = 0;
+
+ if (min > 0 && td->io_ops->commit) {
+ r = td->io_ops->commit(td);
+ if (r < 0)
+ goto out;
+ }
+ if (max > td->cur_depth)
+ max = td->cur_depth;
+ if (min > max)
+ max = min;
+
+ r = 0;
+ if (max && td->io_ops->getevents)
+ r = td->io_ops->getevents(td, min, max, t);
+out:
+ if (r >= 0)
+ io_u_mark_complete(td, r);
+ dprint(FD_IO, "getevents: %d\n", r);
+ return r;
+}
+
+int td_io_queue(struct thread_data *td, struct io_u *io_u)
+{
+ int ret;
+
+ dprint_io_u(io_u, "queue");
+ fio_ro_check(td, io_u);
+
+ assert((io_u->flags & IO_U_F_FLIGHT) == 0);
+ io_u->flags |= IO_U_F_FLIGHT;
+
+ assert(io_u->file->flags & FIO_FILE_OPEN);
+
+ io_u->error = 0;
+ io_u->resid = 0;
+
+ if (td->io_ops->flags & FIO_SYNCIO) {
+ if (fio_fill_issue_time(td))
+ fio_gettime(&io_u->issue_time, NULL);
+
+ /*
+ * only used for iolog
+ */
+ if (td->o.read_iolog_file)
+ memcpy(&td->last_issue, &io_u->issue_time,
+ sizeof(struct timeval));
+ }
+
+ if (io_u->ddir != DDIR_SYNC)
+ td->io_issues[io_u->ddir]++;
+
+ ret = td->io_ops->queue(td, io_u);
+
+ unlock_file(td, io_u->file);
+
+ if (!td->io_ops->commit) {
+ io_u_mark_submit(td, 1);
+ io_u_mark_complete(td, 1);
+ }
+
+ if (ret == FIO_Q_COMPLETED) {
+ if (io_u->ddir != DDIR_SYNC) {
+ io_u_mark_depth(td, 1);
+ td->ts.total_io_u[io_u->ddir]++;
+ }
+ } else if (ret == FIO_Q_QUEUED) {
+ int r;
+
+ if (io_u->ddir != DDIR_SYNC) {
+ td->io_u_queued++;
+ td->ts.total_io_u[io_u->ddir]++;
+ }
+
+ if (td->io_u_queued >= td->o.iodepth_batch) {
+ r = td_io_commit(td);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ if ((td->io_ops->flags & FIO_SYNCIO) == 0) {
+ if (fio_fill_issue_time(td))
+ fio_gettime(&io_u->issue_time, NULL);
+
+ /*
+ * only used for iolog
+ */
+ if (td->o.read_iolog_file)
+ memcpy(&td->last_issue, &io_u->issue_time,
+ sizeof(struct timeval));
+ }
+
+ return ret;
+}
+
+int td_io_init(struct thread_data *td)
+{
+ int ret = 0;
+
+ if (td->io_ops->init) {
+ ret = td->io_ops->init(td);
+ if (ret && td->o.iodepth > 1) {
+ log_err("fio: io engine init failed. Perhaps try"
+ " reducing io depth?\n");
+ }
+ }
+
+ return ret;
+}
+
+int td_io_commit(struct thread_data *td)
+{
+ dprint(FD_IO, "calling ->commit(), depth %d\n", td->cur_depth);
+
+ if (!td->cur_depth || !td->io_u_queued)
+ return 0;
+
+ io_u_mark_depth(td, td->io_u_queued);
+ td->io_u_queued = 0;
+
+ if (td->io_ops->commit)
+ return td->io_ops->commit(td);