X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=engines%2Fnull.c;h=724feca716edea0d105be29fab963ffd6f97341f;hb=946ff86535e86f9b1be618bd4b8ae925343f1df3;hp=6bd51bab218d8179db7cce5fdd7945828fba7ef3;hpb=36167d82e5f49dee91c6d2cd426068edee90e36f;p=fio.git

diff --git a/engines/null.c b/engines/null.c
index 6bd51bab..724feca7 100644
--- a/engines/null.c
+++ b/engines/null.c
@@ -1,5 +1,8 @@
 /*
- * 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>
@@ -11,18 +14,116 @@
 #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, int min_events,
+			      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) {
+		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;
+
+	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;
 }
 
 static struct ioengine_ops ioengine = {
 	.name		= "null",
 	.version	= FIO_IOOPS_VERSION,
+	.setup		= fio_null_setup,
 	.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)