overlay: test copy up by changing mode bits

Changing file attr in overlayfs triggers copy up.
Test this by changing mode bits then check both mode
bits and copy up results.

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

tests/overlay/004

@@ -0,0 +1,97 @@
+#! /bin/bash
+# FS QA Test 004
+#
+# Test file copy up on overlayfs by changing mode bits.
+#
+#-----------------------------------------------------------------------
+# 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
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# Modify as appropriate.
+_supported_fs overlay
+_supported_os Linux
+_require_scratch
+_require_user
+
+# Remove all files from previous tests
+_scratch_mkfs
+
+# Create test file in lower dir
+lowerdir=${SCRATCH_DEV}/${OVERLAY_LOWER_DIR}
+upperdir=${SCRATCH_DEV}/${OVERLAY_UPPER_DIR}
+mkdir -p $lowerdir
+touch ${lowerdir}/attr_file1
+chmod 000 ${lowerdir}/attr_file1
+touch ${lowerdir}/attr_file2
+chmod 000 ${lowerdir}/attr_file2
+
+_scratch_mount
+
+# copy up by change mode bits and check.
+chmod a+x ${SCRATCH_MNT}/attr_file1 > /dev/null 2>&1
+chmod o-w ${SCRATCH_MNT}/attr_file1 > /dev/null 2>&1
+chmod g+w ${SCRATCH_MNT}/attr_file1 > /dev/null 2>&1
+chmod u-r ${SCRATCH_MNT}/attr_file1 > /dev/null 2>&1
+chmod a+X ${SCRATCH_MNT}/attr_file1 > /dev/null 2>&1
+chmod o-s ${SCRATCH_MNT}/attr_file1 > /dev/null 2>&1
+chmod g+t ${SCRATCH_MNT}/attr_file1 > /dev/null 2>&1
+chmod u-X ${SCRATCH_MNT}/attr_file1 > /dev/null 2>&1
+stat -c %a ${SCRATCH_MNT}/attr_file1
+
+# unprivileged user can't do this.
+_user_do "chmod a+x ${SCRATCH_MNT}/attr_file2 > /dev/null 2>&1"
+_user_do "chmod o-w ${SCRATCH_MNT}/attr_file2 > /dev/null 2>&1"
+_user_do "chmod g+w ${SCRATCH_MNT}/attr_file2 > /dev/null 2>&1"
+_user_do "chmod u-r ${SCRATCH_MNT}/attr_file2 > /dev/null 2>&1"
+_user_do "chmod a+X ${SCRATCH_MNT}/attr_file2 > /dev/null 2>&1"
+_user_do "chmod o-s ${SCRATCH_MNT}/attr_file2 > /dev/null 2>&1"
+_user_do "chmod g+t ${SCRATCH_MNT}/attr_file2 > /dev/null 2>&1"
+_user_do "chmod u-X ${SCRATCH_MNT}/attr_file2 > /dev/null 2>&1"
+stat -c %a ${SCRATCH_MNT}/attr_file2
+
+_scratch_unmount
+
+# check mode bits of the file that has been copied up, and
+# the file that should not have been copied up.
+stat -c %a ${upperdir}/attr_file1
+ls ${upperdir}/
+
+# success, all done
+status=0
+exit

tests/overlay/004.out

@@ -0,0 +1,5 @@
+QA output created by 004
+31
+0
+31
+attr_file1

tests/overlay/group

@@ -6,3 +6,4 @@
 001 auto quick copyup
 002 auto quick metadata
 003 auto quick whiteout
+004 attr auto copyup quick