From 76c7c63e131a5f0068932c78b57eef51bc691810 Mon Sep 17 00:00:00 2001
From: Erwan Velu <erwan@enovance.com>
Date: Wed, 10 Jul 2013 16:44:24 +0200
Subject: [PATCH] genfio: Adding cached_based option

By default fio is still run in direct mode which is safer for many
benchmarking approach. In some case, you might need to enable the
cached-based IOs.

The "-c" option is now here for enabling this.
---
 tools/genfio | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/genfio b/tools/genfio
index efc87a29..306d97e5 100755
--- a/tools/genfio
+++ b/tools/genfio
@@ -29,12 +29,15 @@ RUNTIME=300
 ETA=0
 MODES="read,write,randread,randwrite"
 SHORT_HOSTNAME=
+CACHED_IO="FALSE"
 
 show_help() {
 	PROG=$(basename $0)
 	echo "usage of $PROG:"
 	cat << EOF
 -h				: Show this help & exit
+-c				: Enable cached-based IOs
+					by default, fio is run in direct mode
 -a				: Run sequential test then parallel one
 -s				: Run sequential test (default value)
 					one test after another then one disk after another
@@ -78,7 +81,6 @@ cat >$TEMPLATE << EOF
 ioengine=libaio
 invalidate=1
 ramp_time=5
-direct=1
 EOF
 
 if [ "$RUNTIME" != "0" ]; then
@@ -87,6 +89,12 @@ runtime=$RUNTIME
 EOF
 fi
 
+if [ "$CACHED_IO" = "FALSE" ]; then
+cat >>$TEMPLATE << EOF
+direct=1
+EOF
+fi
+
 }
 
 gen_seq_suite() {
@@ -161,7 +169,7 @@ esac
 }
 
 parse_cmdline() {
-while getopts "hapsd:b:r:m:" opt; do
+while getopts "hacpsd:b:r:m:" opt; do
   case $opt in
     h)
 	show_help
@@ -170,6 +178,9 @@ while getopts "hapsd:b:r:m:" opt; do
     b)
 	BLOCK_SIZE=$OPTARG
 	;;
+    c)
+	CACHED_IO="TRUE"
+	;;
     s)
 	if [ "$SEQ" = "-1" ]; then
 		SEQ=1
-- 
2.25.1