From a31041eaf5a306b5f6ad3dd14b60da6212775037 Mon Sep 17 00:00:00 2001
From: gurudas pai <gurudas.pai@oracle.com>
Date: Tue, 23 Oct 2007 15:12:30 +0200
Subject: Add pread/pwrite support to sync engine

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
 engines/sync.c | 46 ++++++++++++++++++++++++++++++++++++----------
 1 file changed, 36 insertions(+), 10 deletions(-)

(limited to 'engines')

diff --git a/engines/sync.c b/engines/sync.c
index 597ee012..3cd4e90a 100644
--- a/engines/sync.c
+++ b/engines/sync.c
@@ -1,8 +1,8 @@
 /*
- * sync engine
+ * sync/psync engine
  *
  * IO engine that does regular read(2)/write(2) with lseek(2) to transfer
- * data.
+ * data and IO engine that does regular pread(2)/pwrite(2) to transfer data.
  *
  */
 #include <stdio.h>
@@ -13,6 +13,8 @@
 
 #include "../fio.h"
 
+#define is_psync(td)    ((td)->io_ops->data == (void *) 1)
+
 static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u)
 {
 	struct fio_file *f = io_u->file;
@@ -37,11 +39,17 @@ static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u)
 
 	fio_ro_check(td, io_u);
 
-	if (io_u->ddir == DDIR_READ)
-		ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
-	else if (io_u->ddir == DDIR_WRITE)
-		ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
-	else
+	if (io_u->ddir == DDIR_READ) {
+		if (is_psync(td))
+			ret = pread(f->fd, io_u->xfer_buf, io_u->xfer_buflen,io_u->offset);
+		else
+			ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
+	} else if (io_u->ddir == DDIR_WRITE) {
+		if (is_psync(td))
+			ret = pwrite(f->fd, io_u->xfer_buf, io_u->xfer_buflen,io_u->offset);
+		else
+			ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
+	} else
 		ret = fsync(f->fd);
 
 	if (ret != (int) io_u->xfer_buflen) {
@@ -59,7 +67,13 @@ static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u)
 	return FIO_Q_COMPLETED;
 }
 
-static struct ioengine_ops ioengine = {
+static int fio_psyncio_init(struct thread_data *td)
+{
+	td->io_ops->data = (void *) 1;
+	return 0;
+}
+
+static struct ioengine_ops ioengine_rw = {
 	.name		= "sync",
 	.version	= FIO_IOOPS_VERSION,
 	.prep		= fio_syncio_prep,
@@ -69,12 +83,24 @@ static struct ioengine_ops ioengine = {
 	.flags		= FIO_SYNCIO,
 };
 
+static struct ioengine_ops ioengine_prw = {
+	.name		= "psync",
+	.version	= FIO_IOOPS_VERSION,
+	.queue		= fio_syncio_queue,
+	.init           = fio_psyncio_init,
+	.open_file	= generic_open_file,
+	.close_file	= generic_close_file,
+	.flags		= FIO_SYNCIO,
+};
+
 static void fio_init fio_syncio_register(void)
 {
-	register_ioengine(&ioengine);
+	register_ioengine(&ioengine_rw);
+	register_ioengine(&ioengine_prw);
 }
 
 static void fio_exit fio_syncio_unregister(void)
 {
-	unregister_ioengine(&ioengine);
+	unregister_ioengine(&ioengine_rw);
+	unregister_ioengine(&ioengine_prw);
 }
-- 
cgit v1.2.3