/*
- * null engine - doesn't do any transfers. Used to test fio.
+ * null engine
+ *
+ * IO engine that doesn't do any real IO transfers, it just pretends to.
+ * The main purpose is to test fio itself.
*
*/
#include <stdio.h>
#include <assert.h>
#include "../fio.h"
-#include "../os.h"
+
+struct null_data {
+ struct io_u **io_us;
+ int queued;
+ int events;
+};
+
+static struct io_u *fio_null_event(struct thread_data *td, int event)
+{
+ struct null_data *nd = td->io_ops->data;
+
+ return nd->io_us[event];
+}
+
+static int fio_null_getevents(struct thread_data *td, unsigned int min_events,
+ unsigned int fio_unused max,
+ struct timespec fio_unused *t)
+{
+ struct null_data *nd = td->io_ops->data;
+ int ret = 0;
+
+ if (min_events) {
+ ret = nd->events;
+ nd->events = 0;
+ }
+
+ return ret;
+}
+
+static int fio_null_commit(struct thread_data *td)
+{
+ struct null_data *nd = td->io_ops->data;
+
+ if (!nd->events) {
+ io_u_mark_submit(td, nd->queued);
+ nd->events = nd->queued;
+ nd->queued = 0;
+ }
+
+ return 0;
+}
static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u)
{
- io_u->resid = 0;
- io_u->error = 0;
- return FIO_Q_COMPLETED;
+ struct null_data *nd = td->io_ops->data;
+
+ fio_ro_check(td, io_u);
+
+ if (td->io_ops->flags & FIO_SYNCIO)
+ return FIO_Q_COMPLETED;
+ if (nd->events)
+ return FIO_Q_BUSY;
+
+ nd->io_us[nd->queued++] = io_u;
+ return FIO_Q_QUEUED;
+}
+
+static int fio_null_open(struct thread_data fio_unused *td,
+ struct fio_file fio_unused *f)
+{
+ return 0;
+}
+
+static void fio_null_cleanup(struct thread_data *td)
+{
+ struct null_data *nd = td->io_ops->data;
+
+ if (nd) {
+ if (nd->io_us)
+ free(nd->io_us);
+ free(nd);
+ }
+}
+
+static int fio_null_init(struct thread_data *td)
+{
+ struct null_data *nd = malloc(sizeof(*nd));
+
+ memset(nd, 0, sizeof(*nd));
+
+ if (td->o.iodepth != 1) {
+ nd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
+ memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *));
+ } else
+ td->io_ops->flags |= FIO_SYNCIO;
+
+ td->io_ops->data = nd;
+ return 0;
}
static struct ioengine_ops ioengine = {
.name = "null",
.version = FIO_IOOPS_VERSION,
.queue = fio_null_queue,
- .flags = FIO_SYNCIO | FIO_NULLIO,
+ .commit = fio_null_commit,
+ .getevents = fio_null_getevents,
+ .event = fio_null_event,
+ .init = fio_null_init,
+ .cleanup = fio_null_cleanup,
+ .open_file = fio_null_open,
+ .flags = FIO_DISKLESSIO,
};
static void fio_init fio_null_register(void)