overlay: getcwd() after a failed rmdir

Test getcwd() failure after unsuccessful rmdir, the getcwd() call
should return the correct path.

Upstream commit ce9113bbcbf4 ("ovl: fix getcwd() failure after
unsuccessful rmdir") fixed this issue.

Reviewed-by: Xiong Zhou <xzhou@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/overlay/007

@@ -0,0 +1,65 @@
+#! /bin/bash
+# FS QA Test 007
+#
+# Test getcwd() failure after unsuccessful rmdir
+#
+# Upstream commit ce9113bbcbf4 ("ovl: fix getcwd() failure after unsuccessful
+# rmdir") fixed this issue
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2016 Red Hat Inc.  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
+
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs overlay
+_supported_os Linux
+_require_test
+
+rm -rf $TEST_DIR/$seq
+
+# make a non-empty dir $seq
+mkdir -p $TEST_DIR/$seq/$seq.sub
+# cd to it and call rmdir on it, rmdir should fail
+cd $TEST_DIR/$seq
+rmdir ../$seq >>$seqres.full 2>&1
+# getcwd should return the correct current dir
+pwd | _filter_test_dir
+
+# success, all done
+status=0
+exit

tests/overlay/007.out

@@ -0,0 +1,2 @@
+QA output created by 007
+TEST_DIR/007

tests/overlay/group

@@ -9,3 +9,4 @@
 004 attr auto copyup quick
 005 auto copyup quick
 006 auto quick copyup whiteout
+007 auto quick