btrfs: nested seed device test

Test case to verify that a sprout device can be a seed device

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
diff --git a/tests/btrfs/162 b/tests/btrfs/162
new file mode 100755
index 0000000..93e4b3c
--- /dev/null
+++ b/tests/btrfs/162
@@ -0,0 +1,103 @@
+#! /bin/bash
+# FS QA Test 162
+#
+# Nested seed device test
+#  Create a seed device
+#  Create a sprout device
+#  Make the sprout device a seed device and create a sprout device again
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2018 Oracle.  All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/filter.btrfs
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs btrfs
+_supported_os Linux
+_require_command "$BTRFS_TUNE_PROG" btrfstune
+_require_scratch_dev_pool 3
+
+_scratch_dev_pool_get 3
+
+dev_seed=$(echo $SCRATCH_DEV_POOL | awk '{print $1}')
+dev_sprout_seed=$(echo $SCRATCH_DEV_POOL | awk '{print $2}')
+dev_sprout=$(echo $SCRATCH_DEV_POOL | awk '{print $3}')
+
+create_seed()
+{
+	_mkfs_dev $dev_seed
+	run_check _mount $dev_seed $SCRATCH_MNT
+	$XFS_IO_PROG -f -d -c "pwrite -S 0xab 0 256K" $SCRATCH_MNT/foobar >\
+		/dev/null
+	echo -- gloden --
+	od -x $SCRATCH_MNT/foobar
+	_run_btrfs_util_prog filesystem show -m $SCRATCH_MNT
+	_scratch_unmount
+	$BTRFS_TUNE_PROG -S 1 $dev_seed
+}
+
+create_sprout_seed()
+{
+	run_check _mount $dev_seed $SCRATCH_MNT
+	_run_btrfs_util_prog device add -f $dev_sprout_seed $SCRATCH_MNT
+	_scratch_unmount
+	$BTRFS_TUNE_PROG -S 1 $dev_sprout_seed
+}
+
+create_next_sprout()
+{
+	run_check _mount -o device=$dev_seed $dev_sprout_seed $SCRATCH_MNT
+	_run_btrfs_util_prog device add -f $dev_sprout $SCRATCH_MNT
+	_scratch_unmount
+	run_check _mount -o device=$dev_seed,device=$dev_sprout_seed \
+		$dev_sprout $SCRATCH_MNT
+	echo -- sprout --
+	od -x $SCRATCH_MNT/foobar
+}
+
+create_seed
+create_sprout_seed
+create_next_sprout
+
+_scratch_dev_pool_put
+
+status=0
+exit
diff --git a/tests/btrfs/162.out b/tests/btrfs/162.out
new file mode 100644
index 0000000..ada7cc5
--- /dev/null
+++ b/tests/btrfs/162.out
@@ -0,0 +1,9 @@
+QA output created by 162
+-- gloden --
+0000000 abab abab abab abab abab abab abab abab
+*
+1000000
+-- sprout --
+0000000 abab abab abab abab abab abab abab abab
+*
+1000000
diff --git a/tests/btrfs/group b/tests/btrfs/group
index 769eb1e..4d25d8f 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -164,3 +164,4 @@
 159 auto quick collapse
 160 auto quick
 161 auto quick
+162 auto quick