[PATCH] xfstest: overlay: Absolute redirect should be followed even if ancestor is opaque

[Vivek Goyal <vgoyal@redhat.com>]

Typically, when following absolute redirect, if an opauqe dentry is
found, lookup in further lower directories is stopped. But if a
child dentry has another absolute redirect, then lookup in further
lower layers should continue.

Say, following is example setup.
upper:  /redirect (redirect=/a/b/c)
lower1: /a/[b]/c       ([b] is opaque) (c has absolute redirect=/a/b/d/)
lower0: /a/b/d/foo

"redirect" directory in upper should merge with lower1:/a/b/c/ and
lower0:/a/b/d/, despite lower1:/a/b/ being opaque.

This example and kernel fix has come from Amir Goldstein. I am just putting
a test for it to make sure its not broken down the line.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
---
 tests/overlay/057     |   97 ++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/overlay/057.out |    2 +
 tests/overlay/group   |    1 
 3 files changed, 100 insertions(+)

Index: xfstests-dev/tests/overlay/057
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ xfstests-dev/tests/overlay/057	2018-03-12 13:28:02.274818432 -0400
@@ -0,0 +1,97 @@
+#! /bin/bash
+# FS QA Test No. 057
+#
+# Test absolute redirect is followed even if ancestor is opaque
+#
+# Typically, when following absolute redirect, if an opauqe dentry is
+# found, lookup in further lower directories is stopped. But if a
+# child dentry has another absolute redirect, then lookup in further
+# lower layers should continue.
+#
+# Say, following is example setup.
+# upper:  /redirect (redirect=/a/b/c)
+# lower1: /a/[b]/c       ([b] is opaque) (c has absolute redirect=/a/b/d/)
+# lower0: /a/b/d/foo
+#
+# "redirect" directory in upper should merge with lower1:/a/b/c/ and
+# lower0:/a/b/d/, despite lower1:/a/b/ being opaque.
+#
+#-----------------------------------------------------------------------
+# Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
+# Author: Vivek Goyal <vgoyal@redhat.com>
+#
+# 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 $seqres.full
+
+# real QA test starts here
+_supported_fs overlay
+_supported_os Linux
+_require_scratch_nocheck
+_require_scratch_overlay_features redirect_dir
+
+# remove all files from previous tests
+_scratch_mkfs
+
+# Create test directories
+lowerdir=$OVL_BASE_SCRATCH_MNT/lower
+lowerdir2=$OVL_BASE_SCRATCH_MNT/lower2
+upperdir=$OVL_BASE_SCRATCH_MNT/upper
+workdir=$OVL_BASE_SCRATCH_MNT/workdir
+workdir2=$OVL_BASE_SCRATCH_MNT/workdir2
+
+make_test_dirs()
+{
+	rm -rf $lowerdir $lowerdir2 $upperdir $workdir $workdir2
+        mkdir -p $lowerdir $lowerdir2 $upperdir $workdir $workdir2
+}
+
+make_test_dirs
+mkdir -p $lowerdir/origin
+touch $lowerdir/origin/foo
+_overlay_scratch_mount_dirs $lowerdir $lowerdir2 $workdir2
+mkdir $SCRATCH_MNT/pure
+mv $SCRATCH_MNT/origin $SCRATCH_MNT/pure/redirect
+$UMOUNT_PROG $SCRATCH_MNT
+_overlay_scratch_mount_dirs $lowerdir2:$lowerdir $upperdir $workdir
+mv $SCRATCH_MNT/pure/redirect $SCRATCH_MNT/redirect
+$UMOUNT_PROG $SCRATCH_MNT
+_overlay_scratch_mount_dirs $lowerdir2:$lowerdir $upperdir $workdir
+ls $SCRATCH_MNT/redirect/
+
+# success, all done
+status=0
+exit
Index: xfstests-dev/tests/overlay/group
===================================================================
--- xfstests-dev.orig/tests/overlay/group	2018-02-28 15:27:29.981693615 -0500
+++ xfstests-dev/tests/overlay/group	2018-03-12 09:31:45.692818432 -0400
@@ -59,3 +59,4 @@
 054 auto quick copyup redirect exportfs
 055 auto quick copyup redirect exportfs nonsamefs
 056 auto quick fsck
+057 auto quick redirect
Index: xfstests-dev/tests/overlay/057.out
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ xfstests-dev/tests/overlay/057.out	2018-03-12 13:09:42.061818432 -0400
@@ -0,0 +1,2 @@
+QA output created by 057
+foo