diff mbox

[V2] Consistent d_ino test for non-samefs setup

Message ID 20171008112558.19061-1-chandan@linux.vnet.ibm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Chandan Rajendra Oct. 8, 2017, 11:25 a.m. UTC 
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
Changelog:
v1->v2:
 Address the following review comments from Amir.
 1. overlay/041 now uses _overlay_scratch_mount_dirs() introduced by the patch
    "overlay: create helper _overlay_scratch_mount_dirs()".
 2. Use _scratch_mkfs() instead of manually setting of the base filesystem.
 3. Use a directory in $OVL_BASE_TEST_DIR as the overlay instance's lowerdir.
 4. Remove redundant invocation of "chown" operation on a regular file to cause
    copy-up to occur.
    
 tests/overlay/041     | 197 ++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/overlay/041.out |   2 +
 tests/overlay/group   |   1 +
 3 files changed, 200 insertions(+)
 create mode 100755 tests/overlay/041
 create mode 100644 tests/overlay/041.out

Comments

Amir Goldstein Oct. 8, 2017, 6:37 p.m. UTC | #1 
On Sun, Oct 8, 2017 at 2:25 PM, Chandan Rajendra
<chandan@linux.vnet.ibm.com> wrote:
> Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
> ---
> Changelog:
> v1->v2:
>  Address the following review comments from Amir.
>  1. overlay/041 now uses _overlay_scratch_mount_dirs() introduced by the patch
>     "overlay: create helper _overlay_scratch_mount_dirs()".

Just to mention explicitly to eryu this depends on a not yet merged
patch on mine

>  2. Use _scratch_mkfs() instead of manually setting of the base filesystem.
>  3. Use a directory in $OVL_BASE_TEST_DIR as the overlay instance's lowerdir.
>  4. Remove redundant invocation of "chown" operation on a regular file to cause
>     copy-up to occur.
>
>  tests/overlay/041     | 197 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  tests/overlay/041.out |   2 +
>  tests/overlay/group   |   1 +
>  3 files changed, 200 insertions(+)
>  create mode 100755 tests/overlay/041
>  create mode 100644 tests/overlay/041.out
>
> diff --git a/tests/overlay/041 b/tests/overlay/041
> new file mode 100755
> index 0000000..5b3920a
> --- /dev/null
> +++ b/tests/overlay/041
> @@ -0,0 +1,197 @@
> +#! /bin/bash
> +# FSQA Test No. 041
> +#
> +# Test consistent d_ino numbers on non-samefs setup
> +# This is a variant of overlay/038 to test consistent d_ino numbers
> +# for non-samefs setup.
> +#
> +#-----------------------------------------------------------------------
> +#
> +# Copyright (C) 2017 IBM Corporation. All Rights Reserved.
> +# Author: Chandan Rajendra <chandan@linux.vnet.ibm.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
> +. ./common/attr
> +
> +# real QA test starts here
> +_supported_fs overlay
> +_supported_os Linux
> +_require_scratch
> +_require_test
> +_require_attrs
> +_require_test_program "t_dir_type"
> +
> +rm -f $seqres.full
> +
> +lowerdir=$OVL_BASE_TEST_DIR/$seq-ovl-lower
> +rm -rf $lowerdir
> +mkdir $lowerdir
> +
> +# Create our test files.
> +mkdir $lowerdir/test_dir/
> +mkdir $lowerdir/test_dir/pure_lower_dir
> +mkdir $lowerdir/test_dir/merged_dir
> +touch $lowerdir/test_file
> +
> +_scratch_mkfs
> +
> +upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
> +workdir=$OVL_BASE_SCRATCH_MNT/$OVL_WORK
> +
> +_overlay_scratch_mount_dirs $lowerdir $upperdir $workdir
> +
> +# mount | grep -i overlay
> +# echo "\$SCRATCH_MNT = $SCRATCH_MNT"

Leftover

> +test_dir=$SCRATCH_MNT/test_dir/
> +merged_dir=$test_dir/merged_dir
> +pure_upper_dir=$merged_dir/pure_upper_dir
> +
> +mkdir -p $pure_upper_dir
> +
> +merged_dir_st_ino=$(stat -c '%i' $merged_dir)
> +
> +# Pure dir's parent d_ino must always be calculated because
> +# it can be residing inside a merged dir.
> +parent_d=$($here/src/t_dir_type $pure_upper_dir $merged_dir_st_ino)
> +[[ $parent_d == ".. d" ]] || \
> +       echo "Pure dir inside a merged dir: Invalid d_ino reported for .."
> +
> +# d_ino for "." must always be calculated because the present
> +# directory can have a copy-up origin.
> +current_d=$($here/src/t_dir_type $merged_dir $merged_dir_st_ino)
> +[[ $current_d == ". d" ]] || echo "Merged dir: Invalid d_ino reported for ."
> +
> +# Verify d_ino of '.' and '..' before and after dir becomes impure.
> +impure_dir=$test_dir/impure_dir
> +mkdir -p $impure_dir
> +
> +impure_dir_st_ino=$(stat -c '%i' $impure_dir)
> +impure_dir_parent_st_ino=$(stat -c '%i' $test_dir)
> +
> +# Before $impure_dir becomes impure
> +parent_d=$($here/src/t_dir_type $impure_dir $impure_dir_parent_st_ino)
> +[[ $parent_d == ".. d" ]] || \
> +    echo "Before dir becomes impure: Invalid d_ino reported for .."
> +
> +current_d=$($here/src/t_dir_type $impure_dir $impure_dir_st_ino)
> +[[ $current_d == ". d" ]] || \
> +    echo "Before dir becomes impure: Invalid d_ino reported for ."
> +
> +
> +mv $SCRATCH_MNT/test_file $impure_dir
> +test_file_st_ino=$(stat -c '%i' $impure_dir/test_file)
> +
> +impure=$($GETFATTR_PROG --absolute-names --only-values -n 'trusted.overlay.impure' \
> +                       $upperdir/test_dir/impure_dir)
> +[[ $impure == "y" ]] || echo "Impure directory missing impure xattr"
> +
> +# After $impure_dir becomes impure
> +parent_d=$($here/src/t_dir_type $impure_dir $impure_dir_parent_st_ino)
> +[[ $parent_d == ".. d" ]] || \
> +    echo "After dir becomes impure: Invalid d_ino reported for .."
> +
> +current_d=$($here/src/t_dir_type $impure_dir $impure_dir_st_ino)
> +[[ $current_d == ". d" ]] || \
> +    echo "After dir becomes impure: Invalid d_ino reported for ."
> +
> +# Verify copy up file's d_ino
> +file_d=$($here/src/t_dir_type $impure_dir $test_file_st_ino)
> +[[ $file_d == "test_file f" ]] || \
> +       echo "Impure dir: Invalid d_ino reported for entry with copy-up origin"
> +
> +# Make $impure_dir pure
> +rm -rf $impure_dir/test_file
> +
> +# Verify invalidation of readdir cache
> +$here/src/t_dir_type $impure_dir $test_file_st_ino
> +[[ $? != 0 ]] || echo "Directory's readdir cache has stale entries"
> +
> +impure=$($GETFATTR_PROG --absolute-names --only-values -n 'trusted.overlay.impure' \
> +                       $upperdir/test_dir/impure_dir 2>/dev/null)
> +[[ -z $impure ]] || echo "Pure directory has impure xattr"
> +
> +# Verify d_ino values corresponding to "." and ".." entries of a
> +# pure lower dir.
> +parent_st_ino=$(stat -c '%i' $SCRATCH_MNT/test_dir)
> +pure_lower_dir=$SCRATCH_MNT/test_dir/pure_lower_dir
> +
> +parent_d=$($here/src/t_dir_type $pure_lower_dir $parent_st_ino)
> +[[ $parent_d == ".. d" ]] || echo "Pure lower dir: Invalid d_ino reported for .."
> +
> +pure_lower_dir_st_ino=$(stat -c '%i' $pure_lower_dir)
> +
> +current_d=$($here/src/t_dir_type $pure_lower_dir $pure_lower_dir_st_ino)
> +[[ $current_d == ". d" ]] || echo "Pure lower dir: Invalid d_ino reported for ."
> +
> +# Verify d_ino of ".." entry of a merged dir.
> +merged_dir=$SCRATCH_MNT/test_dir/merged_dir
> +
> +parent_d=$($here/src/t_dir_type $merged_dir $parent_st_ino)
> +[[ $parent_d == ".. d" ]] || echo "Merged dir: Invalid d_ino reported for .."
> +
> +_overlay_scratch_unmount
> +
> +# Verify pure lower residing in dir which has another lower layer
> +middir=$OVL_BASE_TEST_DIR/$seq-ovl-mid
> +lowerdir=$OVL_BASE_TEST_DIR/$seq-ovl-lower
> +rm -rf $middir
> +rm -rf $lowerdir
> +mkdir $middir
> +mkdir $lowerdir
> +
> +mkdir -p $middir/test_dir
> +mkdir -p $lowerdir/test_dir/pure_lower_dir
> +
> +_scratch_mkfs
> +
> +upperdir=$OVL_BASE_SCRATCH_MNT/ovl-upper
> +workdir=$OVL_BASE_SCRATCH_MNT/ovl-work
> +
> +_overlay_scratch_mount_dirs $middir:$lowerdir $upperdir $workdir
> +
> +# Copy up test_dir
> +touch $SCRATCH_MNT/test_dir/test_file
> +
> +test_dir_st_ino=$(stat -c '%i' $SCRATCH_MNT/test_dir)
> +
> +parent_d=$($here/src/t_dir_type $SCRATCH_MNT/test_dir/pure_lower_dir $test_dir_st_ino)
> +[[ $parent_d == ".. d" ]] || \
> +       echo "Pure lower in dir which has another lower layer: Invalid d_ino reported for .."
> +
> +_overlay_scratch_unmount

Umount of scratch not really needed at end of test but it's fine

> +
> +echo "Silence is golden"
> +status=0
> +exit
> diff --git a/tests/overlay/041.out b/tests/overlay/041.out
> new file mode 100644
> index 0000000..04f5bf1
> --- /dev/null
> +++ b/tests/overlay/041.out
> @@ -0,0 +1,2 @@
> +QA output created by 041
> +Silence is golden
> diff --git a/tests/overlay/group b/tests/overlay/group
> index 022f2ef..89f6325 100644
> --- a/tests/overlay/group
> +++ b/tests/overlay/group
> @@ -43,3 +43,4 @@
>  038 auto quick copyup
>  039 auto quick atime
>  040 auto quick
> +041 auto quick copyup
> --
> 2.9.5
>
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Dave Chinner Oct. 8, 2017, 9:40 p.m. UTC | #2 
On Sun, Oct 08, 2017 at 04:55:58PM +0530, Chandan Rajendra wrote:
> Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>

Can you please describe the test, what bug it's addressing, what a
"non-samefs" configuration is, etc in the commit message? 

I've got absolutely no clue what this test is actually trying to
exercise, and I doubt anyone not intimately familiar with overlay
has any idea, either...

Cheers,

Dave.
Chandan Rajendra Oct. 9, 2017, 5:31 a.m. UTC | #3 
On Monday, October 9, 2017 12:07:08 AM IST Amir Goldstein wrote:
> On Sun, Oct 8, 2017 at 2:25 PM, Chandan Rajendra
> <chandan@linux.vnet.ibm.com> wrote:
> > Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
> > ---
> > Changelog:
> > v1->v2:
> >  Address the following review comments from Amir.
> >  1. overlay/041 now uses _overlay_scratch_mount_dirs() introduced by the patch
> >     "overlay: create helper _overlay_scratch_mount_dirs()".
> 
> Just to mention explicitly to eryu this depends on a not yet merged
> patch on mine
> 
> >  2. Use _scratch_mkfs() instead of manually setting of the base filesystem.
> >  3. Use a directory in $OVL_BASE_TEST_DIR as the overlay instance's lowerdir.
> >  4. Remove redundant invocation of "chown" operation on a regular file to cause
> >     copy-up to occur.
> >
> >  tests/overlay/041     | 197 ++++++++++++++++++++++++++++++++++++++++++++++++++
> >  tests/overlay/041.out |   2 +
> >  tests/overlay/group   |   1 +
> >  3 files changed, 200 insertions(+)
> >  create mode 100755 tests/overlay/041
> >  create mode 100644 tests/overlay/041.out
> >
> > diff --git a/tests/overlay/041 b/tests/overlay/041
> > new file mode 100755
> > index 0000000..5b3920a
> > --- /dev/null
> > +++ b/tests/overlay/041
> > @@ -0,0 +1,197 @@
> > +#! /bin/bash
> > +# FSQA Test No. 041
> > +#
> > +# Test consistent d_ino numbers on non-samefs setup
> > +# This is a variant of overlay/038 to test consistent d_ino numbers
> > +# for non-samefs setup.
> > +#
> > +#-----------------------------------------------------------------------
> > +#
> > +# Copyright (C) 2017 IBM Corporation. All Rights Reserved.
> > +# Author: Chandan Rajendra <chandan@linux.vnet.ibm.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
> > +. ./common/attr
> > +
> > +# real QA test starts here
> > +_supported_fs overlay
> > +_supported_os Linux
> > +_require_scratch
> > +_require_test
> > +_require_attrs
> > +_require_test_program "t_dir_type"
> > +
> > +rm -f $seqres.full
> > +
> > +lowerdir=$OVL_BASE_TEST_DIR/$seq-ovl-lower
> > +rm -rf $lowerdir
> > +mkdir $lowerdir
> > +
> > +# Create our test files.
> > +mkdir $lowerdir/test_dir/
> > +mkdir $lowerdir/test_dir/pure_lower_dir
> > +mkdir $lowerdir/test_dir/merged_dir
> > +touch $lowerdir/test_file
> > +
> > +_scratch_mkfs
> > +
> > +upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
> > +workdir=$OVL_BASE_SCRATCH_MNT/$OVL_WORK
> > +
> > +_overlay_scratch_mount_dirs $lowerdir $upperdir $workdir
> > +
> > +# mount | grep -i overlay
> > +# echo "\$SCRATCH_MNT = $SCRATCH_MNT"
> 
> Leftover
> 

Sorry, I will post the next version of the patch with those statements removed.

Thanks once again for reviewing the patch.
Amir Goldstein Oct. 9, 2017, 5:45 a.m. UTC | #4 
On Mon, Oct 9, 2017 at 12:40 AM, Dave Chinner <david@fromorbit.com> wrote:
> On Sun, Oct 08, 2017 at 04:55:58PM +0530, Chandan Rajendra wrote:
>> Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
>
> Can you please describe the test, what bug it's addressing, what a
> "non-samefs" configuration is, etc in the commit message?
>

Chandan I suggest that you include the elaborate description
That was part of 038 commit message in both test descriptions.

To be clear, please State the goal of this test is to verify that
Inode numbers returned by readdir d_ino are consistent with
Inode numbers returned by stat st_ino in all the listed cases.

> I've got absolutely no clue what this test is actually trying to
> exercise, and I doubt anyone not intimately familiar with overlay
> has any idea, either...
>
> Cheers,
>
> Dave.
> --
> Dave Chinner
> david@fromorbit.com
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diff mbox

Patch

diff --git a/tests/overlay/041 b/tests/overlay/041
new file mode 100755
index 0000000..5b3920a
--- /dev/null
+++ b/tests/overlay/041
@@ -0,0 +1,197 @@ 
+#! /bin/bash
+# FSQA Test No. 041
+#
+# Test consistent d_ino numbers on non-samefs setup
+# This is a variant of overlay/038 to test consistent d_ino numbers
+# for non-samefs setup.
+#
+#-----------------------------------------------------------------------
+#
+# Copyright (C) 2017 IBM Corporation. All Rights Reserved.
+# Author: Chandan Rajendra <chandan@linux.vnet.ibm.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
+. ./common/attr
+
+# real QA test starts here
+_supported_fs overlay
+_supported_os Linux
+_require_scratch
+_require_test
+_require_attrs
+_require_test_program "t_dir_type"
+
+rm -f $seqres.full
+
+lowerdir=$OVL_BASE_TEST_DIR/$seq-ovl-lower
+rm -rf $lowerdir
+mkdir $lowerdir
+
+# Create our test files.
+mkdir $lowerdir/test_dir/
+mkdir $lowerdir/test_dir/pure_lower_dir
+mkdir $lowerdir/test_dir/merged_dir
+touch $lowerdir/test_file
+
+_scratch_mkfs
+
+upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
+workdir=$OVL_BASE_SCRATCH_MNT/$OVL_WORK
+
+_overlay_scratch_mount_dirs $lowerdir $upperdir $workdir
+
+# mount | grep -i overlay
+# echo "\$SCRATCH_MNT = $SCRATCH_MNT"
+test_dir=$SCRATCH_MNT/test_dir/
+merged_dir=$test_dir/merged_dir
+pure_upper_dir=$merged_dir/pure_upper_dir
+
+mkdir -p $pure_upper_dir
+
+merged_dir_st_ino=$(stat -c '%i' $merged_dir)
+
+# Pure dir's parent d_ino must always be calculated because
+# it can be residing inside a merged dir.
+parent_d=$($here/src/t_dir_type $pure_upper_dir $merged_dir_st_ino)
+[[ $parent_d == ".. d" ]] || \
+	echo "Pure dir inside a merged dir: Invalid d_ino reported for .."
+
+# d_ino for "." must always be calculated because the present
+# directory can have a copy-up origin.
+current_d=$($here/src/t_dir_type $merged_dir $merged_dir_st_ino)
+[[ $current_d == ". d" ]] || echo "Merged dir: Invalid d_ino reported for ."
+
+# Verify d_ino of '.' and '..' before and after dir becomes impure.
+impure_dir=$test_dir/impure_dir
+mkdir -p $impure_dir
+
+impure_dir_st_ino=$(stat -c '%i' $impure_dir)
+impure_dir_parent_st_ino=$(stat -c '%i' $test_dir)
+
+# Before $impure_dir becomes impure
+parent_d=$($here/src/t_dir_type $impure_dir $impure_dir_parent_st_ino)
+[[ $parent_d == ".. d" ]] || \
+    echo "Before dir becomes impure: Invalid d_ino reported for .."
+
+current_d=$($here/src/t_dir_type $impure_dir $impure_dir_st_ino)
+[[ $current_d == ". d" ]] || \
+    echo "Before dir becomes impure: Invalid d_ino reported for ."
+
+
+mv $SCRATCH_MNT/test_file $impure_dir
+test_file_st_ino=$(stat -c '%i' $impure_dir/test_file)
+
+impure=$($GETFATTR_PROG --absolute-names --only-values -n 'trusted.overlay.impure' \
+			$upperdir/test_dir/impure_dir)
+[[ $impure == "y" ]] || echo "Impure directory missing impure xattr"
+
+# After $impure_dir becomes impure
+parent_d=$($here/src/t_dir_type $impure_dir $impure_dir_parent_st_ino)
+[[ $parent_d == ".. d" ]] || \
+    echo "After dir becomes impure: Invalid d_ino reported for .."
+
+current_d=$($here/src/t_dir_type $impure_dir $impure_dir_st_ino)
+[[ $current_d == ". d" ]] || \
+    echo "After dir becomes impure: Invalid d_ino reported for ."
+
+# Verify copy up file's d_ino
+file_d=$($here/src/t_dir_type $impure_dir $test_file_st_ino)
+[[ $file_d == "test_file f" ]] || \
+	echo "Impure dir: Invalid d_ino reported for entry with copy-up origin"
+
+# Make $impure_dir pure
+rm -rf $impure_dir/test_file
+
+# Verify invalidation of readdir cache
+$here/src/t_dir_type $impure_dir $test_file_st_ino
+[[ $? != 0 ]] || echo "Directory's readdir cache has stale entries"
+
+impure=$($GETFATTR_PROG --absolute-names --only-values -n 'trusted.overlay.impure' \
+			$upperdir/test_dir/impure_dir 2>/dev/null)
+[[ -z $impure ]] || echo "Pure directory has impure xattr"
+
+# Verify d_ino values corresponding to "." and ".." entries of a
+# pure lower dir.
+parent_st_ino=$(stat -c '%i' $SCRATCH_MNT/test_dir)
+pure_lower_dir=$SCRATCH_MNT/test_dir/pure_lower_dir
+
+parent_d=$($here/src/t_dir_type $pure_lower_dir $parent_st_ino)
+[[ $parent_d == ".. d" ]] || echo "Pure lower dir: Invalid d_ino reported for .."
+
+pure_lower_dir_st_ino=$(stat -c '%i' $pure_lower_dir)
+
+current_d=$($here/src/t_dir_type $pure_lower_dir $pure_lower_dir_st_ino)
+[[ $current_d == ". d" ]] || echo "Pure lower dir: Invalid d_ino reported for ."
+
+# Verify d_ino of ".." entry of a merged dir.
+merged_dir=$SCRATCH_MNT/test_dir/merged_dir
+
+parent_d=$($here/src/t_dir_type $merged_dir $parent_st_ino)
+[[ $parent_d == ".. d" ]] || echo "Merged dir: Invalid d_ino reported for .."
+
+_overlay_scratch_unmount
+
+# Verify pure lower residing in dir which has another lower layer
+middir=$OVL_BASE_TEST_DIR/$seq-ovl-mid
+lowerdir=$OVL_BASE_TEST_DIR/$seq-ovl-lower
+rm -rf $middir
+rm -rf $lowerdir
+mkdir $middir
+mkdir $lowerdir
+
+mkdir -p $middir/test_dir
+mkdir -p $lowerdir/test_dir/pure_lower_dir
+
+_scratch_mkfs
+
+upperdir=$OVL_BASE_SCRATCH_MNT/ovl-upper
+workdir=$OVL_BASE_SCRATCH_MNT/ovl-work
+
+_overlay_scratch_mount_dirs $middir:$lowerdir $upperdir $workdir
+
+# Copy up test_dir
+touch $SCRATCH_MNT/test_dir/test_file
+
+test_dir_st_ino=$(stat -c '%i' $SCRATCH_MNT/test_dir)
+
+parent_d=$($here/src/t_dir_type $SCRATCH_MNT/test_dir/pure_lower_dir $test_dir_st_ino)
+[[ $parent_d == ".. d" ]] || \
+	echo "Pure lower in dir which has another lower layer: Invalid d_ino reported for .."
+
+_overlay_scratch_unmount
+
+echo "Silence is golden"
+status=0
+exit
diff --git a/tests/overlay/041.out b/tests/overlay/041.out
new file mode 100644
index 0000000..04f5bf1
--- /dev/null
+++ b/tests/overlay/041.out
@@ -0,0 +1,2 @@ 
+QA output created by 041
+Silence is golden
diff --git a/tests/overlay/group b/tests/overlay/group
index 022f2ef..89f6325 100644
--- a/tests/overlay/group
+++ b/tests/overlay/group
@@ -43,3 +43,4 @@ 
 038 auto quick copyup
 039 auto quick atime
 040 auto quick
+041 auto quick copyup