[PATCH] xfstests: Teste root inode parent pointer repairing

[Marco Benatto <mbenatto@redhat.com>]

Recently we found out xfs_repair were not repairing
root inode parent pointer when root inode is on short-form
and parent points to an invalid inode number (refer to:
"xfs_repair: Fix root inode's parent when it's bogus for sf
directory" on xfs-devel list).

This test checks if xfs_repair successfully repair the
filesystem in the scenario mentioned before.

Signed-off-by: Marco Benatto <mbenatto@redhat.com>
---
 tests/xfs/450     | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/450.out |  1 +
 tests/xfs/group   |  1 +
 3 files changed, 67 insertions(+)
 create mode 100755 tests/xfs/450
 create mode 100644 tests/xfs/450.out

diff --git a/tests/xfs/450 b/tests/xfs/450
new file mode 100755
index 0000000..7e33431
--- /dev/null
+++ b/tests/xfs/450
@@ -0,0 +1,65 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2018 Red Hat Inc.  All Rights Reserved.
+#
+# FS QA Test 450
+#
+# Make sure xfs_repair can repair root inode parent's pointer
+# when it contains a bogus ino when it's using shot form directory
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+
+status=1	# failure is the default!
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs xfs
+_supported_os Linux
+_require_scratch
+
+
+_scratch_mkfs >> /dev/null 2>&1
+
+# Check on-disk format version
+ver=$($XFS_DB_PROG -c 'sb 0' -c 'addr rootino' -c 'p core.version' $SCRATCH_DEV |
+		awk '{print$3}')
+
+case $ver in
+	2)
+		prefix="u.sfdir2"
+		;;
+	3)
+		prefix="u3.sfdir3"
+		;;
+	*)
+		_notrun "can't modify this disk format"
+		;;
+esac
+
+_scratch_xfs_db -x -c 'sb 0' \
+					-c 'addr rootino' \
+					-c "write ${prefix}.hdr.parent.i4 0" >> /$seqres.full 2>&1 \
+				|| _fail "xfs_db command failed"
+
+_scratch_xfs_repair >> $seqres.full 2>&1
+
+_scratch_xfs_repair -n >> $seqres.full 2>&1
+
+if [ $? -eq 1 ]
+then
+	_fail "xfs_repair failed to repair filesystem"
+else
+	echo "OK"
+	status=0
+fi
+
+exit
diff --git a/tests/xfs/450.out b/tests/xfs/450.out
new file mode 100644
index 0000000..d86bac9
--- /dev/null
+++ b/tests/xfs/450.out
@@ -0,0 +1 @@
+OK
diff --git a/tests/xfs/group b/tests/xfs/group
index 932ab90..3a1db0b 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -447,3 +447,4 @@
 447 auto mount
 448 auto quick fuzzers
 449 auto quick
+450 auto quick
-- 
2.9.5