/*
- * 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 "../fio.h"
#include "../os.h"
-static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u)
+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)
{
- io_u->resid = 0;
- io_u->error = 0;
- return FIO_Q_COMPLETED;
+ struct null_data *nd = td->io_ops->data;
+
+ return nd->io_us[event];
}
-static int fio_null_setup(struct thread_data *td)
+static int fio_null_getevents(struct thread_data *td, int min_events,
+ int fio_unused max, struct timespec fio_unused *t)
{
- struct fio_file *f;
- int i;
-
- if (!td->total_file_size) {
- log_err("fio: need size= set\n");
- return 1;
+ struct null_data *nd = td->io_ops->data;
+ int ret = 0;
+
+ if (min_events) {
+ ret = nd->events;
+ nd->events = 0;
}
- td->io_size = td->total_file_size;
- td->total_io_size = td->io_size;
+ return ret;
+}
- for_each_file(td, f, i) {
- f->fd = dup(STDOUT_FILENO);
- f->real_file_size = td->total_io_size / td->nr_files;
- f->file_size = f->real_file_size;
+static int fio_null_commit(struct thread_data *td)
+{
+ struct null_data *nd = td->io_ops->data;
+
+ if (!nd->events) {
+ 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)
+{
+ struct null_data *nd = td->io_ops->data;
+
+ 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;
+ unsigned int i;
+
+ for_each_file(td, f, i)
+ f->real_file_size = -1ULL;
+
+ return 0;
+}
+
static int fio_null_open(struct thread_data fio_unused *td,
struct fio_file fio_unused *f)
{
+ f->fd = 0;
+ 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);
+ td->io_ops->data = NULL;
+ }
+}
+
+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;
}
.version = FIO_IOOPS_VERSION,
.setup = fio_null_setup,
.queue = fio_null_queue,
+ .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_SYNCIO | FIO_DISKLESSIO,
+ .flags = FIO_DISKLESSIO,
};
static void fio_init fio_null_register(void)