genfio: Claryfing default options

Let's show the help if no disks are given as parameter.

This patch does also clarify the default values of each parameter.
That clearly helps understanding what's the default settings if no
option used.

diff --git a/tools/genfio b/tools/genfio
index 306d97e5b481288642947d61e39e72aa554b53ff..195a86135e460ef32f0d48d5137744f6ae529195 100755 (executable)
--- a/tools/genfio
+++ b/tools/genfio
@@ -37,20 +37,26 @@ show_help() {
        cat << EOF
 -h                             : Show this help & exit
 -c                             : Enable cached-based IOs
-                                       by default, fio is run in direct mode
+                                       Disabled by default
 -a                             : Run sequential test then parallel one
+                                       Disabled by default
 -s                             : Run sequential test (default value)
                                        one test after another then one disk after another
+                                       Disabled by default
 -p                             : Run parallel test
                                        one test after anoter but all disks at the same time
+                                       Enabled by default
 -d disk1[,disk2,disk3,..]      : Run the tests on the selected disks
                                        Separated each disk with a comma
                                        Disk name shall be "sdxx", /dev/ shall NOT be used here
--r seconds                     : Time in seconds per benchmark (300 as default)
+-r seconds                     : Time in seconds per benchmark
                                        0 means till the end of the device
+                                       Default is 300 seconds
 -b blocksize[,blocksize1, ...]  : The blocksizes to test under fio format (4k, 1m, ...)
                                        Separated each blocksize with a comma
+                                       Default is 4k
 -m mode1,[mode2,mode3, ...]     : Define the fio IO profile to use like read, write, randread, randwrite
+                                       Default is "read,write,randread,randwrite"
 
 Example:
 
@@ -229,7 +235,8 @@ esac
 
 if [ -z "$DISKS" ]; then
        echo "Missing DISKS !"
-       echo "Exiting !"
+       echo "Please read the help !"
+       show_help
        exit 1
 fi