[PATCH -v3 1/1] mdadm/test: Add one test case for raid5 reshape

[Xiao Ni <xni@redhat.com>]

This case trys to allow raid5 reshape to use backwards direction.
It changes chunksize after reshape and stop the raid. Then start
the raid again.

Signed-off-by: Xiao Ni <xni@redhat.com>
Suggested-by:  Jes Sorensen <jes.sorensen@gmail.com>
Suggested-by:  Zhilong Liu <zlliu@suse.com> 
---
 test           |  8 ++++++++
 tests/02r5grow | 16 ++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/test b/test
index 87e2df2..51da2dc 100755
--- a/test
+++ b/test
@@ -320,6 +320,14 @@ check() {
 		grep -sq "inactive" /proc/mdstat ||
 			die "array is not inactive!"
 		;;
+	# It only can be used when there is only one raid
+	chunk )
+		chunk_size=`cat /proc/mdstat  | awk -F',' '/chunk/{print $2}' | awk '{print $1}' | sed s/k//g`
+		if [ $chunk_size -ne $2 ]; then
+			echo >&2 "chunksize is not right"
+			exit 1
+		fi
+		;;
 	* )
 		die "unknown check $1"
 		;;
diff --git a/tests/02r5grow b/tests/02r5grow
index 386e82e..20db4cd 100644
--- a/tests/02r5grow
+++ b/tests/02r5grow
@@ -34,3 +34,19 @@ check nosync
 sh tests/testdev $md0 3 $[size/2] 128
 
 mdadm -S $md0
+
+# create a raid5 array and change the chunk
+mdadm -CR $md0 --level raid5 --metadata=1.1 --chunk=32 --raid-disks 3 --size $[size/2] $dev1 $dev2 $dev3
+check wait
+check state UUU
+check chunk 32
+
+mdadm $md0 --grow --chunk=64
+check reshape
+check wait
+check chunk 64
+
+mdadm -S $md0
+mdadm -As
+check state UUU
+check chunk 64
-- 
2.7.4