/*
- * 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;
return nd->io_us[event];
}
-static int fio_null_getevents(struct thread_data *td, int fio_unused min,
+static int fio_null_getevents(struct thread_data *td, int min_events,
int fio_unused max, struct timespec fio_unused *t)
{
struct null_data *nd = td->io_ops->data;
- int ret;
+ int ret = 0;
+
+ if (min_events) {
+ ret = nd->events;
+ nd->events = 0;
+ }
- ret = nd->events;
- nd->events = 0;
return ret;
}
{
struct null_data *nd = td->io_ops->data;
- nd->events = nd->queued;
- nd->queued = 0;
+ if (!nd->events) {
+ nd->events = nd->queued;
+ nd->queued = 0;
+ }
+
return 0;
}
{
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_setup(struct thread_data *td)
-{
- struct fio_file *f;
- int i;
-
- if (!td->total_file_size) {
- log_err("fio: need size= set\n");
- return 1;
- }
-
- td->io_size = td->total_file_size;
- td->total_io_size = td->io_size;
-
- for_each_file(td, f, i) {
- f->real_file_size = td->total_io_size / td->nr_files;
- f->file_size = f->real_file_size;
- }
-
- return 0;
-}
-
static int fio_null_open(struct thread_data fio_unused *td,
struct fio_file fio_unused *f)
{
- f->fd = 0;
return 0;
}
memset(nd, 0, sizeof(*nd));
- if (td->iodepth != 1) {
- nd->io_us = malloc(td->iodepth * sizeof(struct io_u *));
- memset(nd->io_us, 0, td->iodepth * sizeof(struct io_u *));
+ 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;
static struct ioengine_ops ioengine = {
.name = "null",
.version = FIO_IOOPS_VERSION,
- .setup = fio_null_setup,
.queue = fio_null_queue,
.commit = fio_null_commit,
.getevents = fio_null_getevents,