[xfstest PATCH V2 2/2] overlay/031: add tests of whiteouts in lowerdir and both dirs

["zhangyi (F)" <yi.zhang@huawei.com>]

In overlay/031, it only cover the test case of whiteouts in
origined upper dir. This patch add two cases cover the other
two situations:

1) Lower origined dir have whiteouts;
2) Both upper and lower origined dirs have whiteouts (although
this case is pass now, still add this to cover all three kinds
of situations).

Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
---
 tests/overlay/031 | 58 ++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 47 insertions(+), 11 deletions(-)

diff --git a/tests/overlay/031 b/tests/overlay/031
index cb29ee5..b7bad3a 100755
--- a/tests/overlay/031
+++ b/tests/overlay/031
@@ -1,9 +1,10 @@
 #! /bin/bash
 # FS QA Test 031
 #
-# The unmerged and impure upper directories may contain invalid
-# whiteouts when we change lowerdir(e.g. clean up dir) and remount
-# overlay. This may lead to whiteouts exposure and rmdir failure.
+# The unmerged and origined directories may contain invalid
+# whiteouts when we change underlaying dir (e.g. clean up lowerdir)
+# and remount overlay. This may lead to whiteouts exposure and
+# rmdir failure.
 #
 #-----------------------------------------------------------------------
 # Copyright (c) 2017 Huawei.  All Rights Reserved.
@@ -67,19 +68,21 @@ _require_scratch
 _scratch_mkfs
 
 # create test directorys and whiteout
-lowerdir=$OVL_BASE_SCRATCH_MNT/lower
+lowerdir1=$OVL_BASE_SCRATCH_MNT/lower1
+lowerdir2=$OVL_BASE_SCRATCH_MNT/lower2
 upperdir=$OVL_BASE_SCRATCH_MNT/upper
 workdir=$OVL_BASE_SCRATCH_MNT/workdir
-testfile=a
-mkdir -p $lowerdir $upperdir $workdir
+testfile1=a
+testfile2=b
+mkdir -p $lowerdir1 $lowerdir2 $upperdir $workdir
 
-_create_whiteout $lowerdir $upperdir $workdir $testfile
+_create_whiteout $lowerdir1 $upperdir $workdir $testfile1
 
 # clean up the lower directory and mount overlay again,
 # whiteout will expose.
-rm -rf $lowerdir/testdir
+rm -rf $lowerdir1/testdir
 
-_overlay_mount_dirs $lowerdir $upperdir $workdir $OVL_BASE_SCRATCH_MNT $SCRATCH_MNT
+_overlay_mount_dirs $lowerdir1 $upperdir $workdir $OVL_BASE_SCRATCH_MNT $SCRATCH_MNT
 
 ls $SCRATCH_MNT/testdir
 
@@ -90,15 +93,48 @@ rm -rf $SCRATCH_MNT/testdir 2>&1 | _filter_scratch
 # umount overlay again, create a new file with the same name and
 # mount overlay again.
 $UMOUNT_PROG $SCRATCH_MNT
-touch $lowerdir/testdir
+touch $lowerdir1/testdir
 
-_overlay_mount_dirs $lowerdir $upperdir $workdir $OVL_BASE_SCRATCH_MNT $SCRATCH_MNT
+_overlay_mount_dirs $lowerdir1 $upperdir $workdir $OVL_BASE_SCRATCH_MNT $SCRATCH_MNT
 
 # try to remove test dir from overlay dir, trigger ovl_remove_and_whiteout,
 # it will not clean up the dir and lead to residue.
 rm -rf $SCRATCH_MNT/testdir 2>&1 | _filter_scratch
 ls $workdir/work
 
+$UMOUNT_PROG $SCRATCH_MNT
+
+# let lower dir have invalid whiteouts, repeat ls and rmdir test again.
+rm -rf $lowerdir1/testdir
+rm -rf $upperdir/testdir
+
+_create_whiteout $lowerdir2 $lowerdir1 $workdir $testfile1
+
+rm -rf $lowerdir2/testdir
+
+_overlay_mount_dirs "$lowerdir1:$lowerdir2" $upperdir $workdir \
+		     $OVL_BASE_SCRATCH_MNT $SCRATCH_MNT
+
+ls $SCRATCH_MNT/testdir
+rm -rf $SCRATCH_MNT/testdir 2>&1 | _filter_scratch
+
+$UMOUNT_PROG $SCRATCH_MNT
+
+# let lower dir and upper dir both have invalid whiteouts, repeat ls and rmdir again.
+rm -rf $lowerdir1/testdir
+rm -rf $upperdir/testdir
+
+_create_whiteout $lowerdir1 $upperdir $workdir $testfile1
+
+rm -rf $lowerdir1/testdir
+
+_create_whiteout $lowerdir2 $lowerdir1 $workdir $testfile2
+
+_overlay_mount_dirs $lowerdir1 $upperdir $workdir $OVL_BASE_SCRATCH_MNT $SCRATCH_MNT
+
+ls $SCRATCH_MNT/testdir
+rm -rf $SCRATCH_MNT/testdir 2>&1 | _filter_scratch
+
 # success, all done
 echo "Silence is golden"
 status=0
-- 
2.5.0