[PATCH] fstests: Verify that removed device has its superblocks deleted

[Nikolay Borisov <nborisov@suse.com>]

When a device is removed from a btrfs filesystem its superblock copies
must be deleted. This test ensures this is indeed the case.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
 tests/btrfs/184     | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/btrfs/184.out |  2 ++
 tests/btrfs/group   |  1 +
 3 files changed, 60 insertions(+)
 create mode 100755 tests/btrfs/184
 create mode 100644 tests/btrfs/184.out

diff --git a/tests/btrfs/184 b/tests/btrfs/184
new file mode 100755
index 000000000000..3bf7d201a145
--- /dev/null
+++ b/tests/btrfs/184
@@ -0,0 +1,57 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2019 SUSE LLC. All Rights Reserved.
+#
+# FS QA Test 184
+#
+# Verify that when a device is removed from a multi-device
+# filesystem its superblock copies are correctly deleted
+#
+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
+
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs btrfs
+_supported_os Linux
+_require_scratch
+_require_scratch_dev_pool 2
+_require_btrfs_command inspect-internal dump-super
+
+_scratch_pool_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed"
+_scratch_mount
+                                                                            
+# pick last dev in the list
+dev_del=`echo ${SCRATCH_DEV_POOL} | awk '{print $NF}'`
+$BTRFS_UTIL_PROG device delete $dev_del $SCRATCH_MNT || _fail "btrfs device delete failed"
+for i in {0..2}; do
+    output=$($BTRFS_UTIL_PROG inspect-internal dump-super -s $i $dev_del 2>&1)
+    $BTRFS_UTIL_PROG inspect-internal dump-super -s $i $dev_del 2>&1 | grep -q "bad magic"
+    ret=$?
+    if [[ "$output" != "" && $ret -eq 1 ]]; then
+        _fail "Deleted dev superblocks not scratched"
+    fi
+done
+_scratch_unmount
+
+# success, all done
+echo "Silence is golden"
+status=0
+exit
diff --git a/tests/btrfs/184.out b/tests/btrfs/184.out
new file mode 100644
index 000000000000..b4ce96cfc047
--- /dev/null
+++ b/tests/btrfs/184.out
@@ -0,0 +1,2 @@
+QA output created by 184
+Silence is golden
diff --git a/tests/btrfs/group b/tests/btrfs/group
index f3227c1708d9..c1d215bf5ff8 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -186,3 +186,4 @@
 181 auto quick balance
 182 auto quick balance
 183 auto quick clone compress punch
+184 auto quick volume
-- 
2.7.4