[xfstests v4 8/8] overlay: accessing stacked overlayfs files

Xiong Zhou
2017-02-23T09:43:30Z

Lower dir comes from another overlayfs dir, then
accessing files in it should work.

CC: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Xiong Zhou <xzhou@redhat.com>
---
tests/overlay/029 | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++
tests/overlay/029.out | 5 +++
tests/overlay/group | 1 +
3 files changed, 106 insertions(+)
create mode 100755 tests/overlay/029
create mode 100644 tests/overlay/029.out

diff --git a/tests/overlay/029 b/tests/overlay/029
new file mode 100755
index 0000000..902a84c
--- /dev/null
+++ b/tests/overlay/029
@@ -0,0 +1,100 @@
+#! /bin/bash
+# FS QA Test 029
+#
+# There are dirs/files in lower dir and upper dir before
+# mounting overlayfs. After mounting, use dir in overlayfs
+# mountpoint as lowerdir to mount another overlayfs, then
+# access old files through the second overlayfs. It was
+# not working, kernel commit below fixed it.
+#
+# c4fcfc1619ea ovl: fix d_real() for stacked fs
+#
+# This reproducer was originally written by
+# Miklos Szeredi <mszeredi@redhat.com>
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 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 /
+ $UMOUNT_PROG $tmp/mnt
+ rm -rf $tmp
+ rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs overlay
+_supported_os Linux
+_require_scratch
+
+# Remove all files from previous tests
+_scratch_mkfs
+
+# Preparing files
+upperdir=$SCRATCH_DEV/$OVERLAY_UPPER_DIR
+lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+mkdir -p $upperdir/up
+echo foo > $upperdir/up/foo
+mkdir -p $lowerdir/low
+echo bar > $lowerdir/low/bar
+
+# mount overlay in SCRATCH_MNT
+_scratch_mount
+
+mkdir -p $tmp/{upper,mnt,work}
+# mount overlay again using upper dir from SCRATCH_MNT dir
+_overlay_mount_dirs $SCRATCH_MNT/up $tmp/{upper,work} \
+ overlay $tmp/mnt
+# accessing file in the second mount
+cat $tmp/mnt/foo
+$UMOUNT_PROG $tmp/mnt
+
+# mount overlay again using lower dir from SCRATCH_MNT dir
+_overlay_mount_dirs $SCRATCH_MNT/low $tmp/{upper,work} \
+ overlay $tmp/mnt
+cat $tmp/mnt/bar
+$UMOUNT_PROG $tmp/mnt
+
+# mount overlay again using SCRATCH_MNT dir
+_overlay_mount_dirs $SCRATCH_MNT/ $tmp/{upper,work} \
+ overlay $tmp/mnt
+cat $tmp/mnt/up/foo
+cat $tmp/mnt/low/bar
+
+# success, all done
+status=0
+exit
diff --git a/tests/overlay/029.out b/tests/overlay/029.out
new file mode 100644
index 0000000..e7f192c
--- /dev/null
+++ b/tests/overlay/029.out
@@ -0,0 +1,5 @@
+QA output created by 029
+foo
+bar
+foo
+bar
diff --git a/tests/overlay/group b/tests/overlay/group
index cf058fc..7e72a30 100644
--- a/tests/overlay/group
+++ b/tests/overlay/group
@@ -31,3 +31,4 @@
026 auto attr quick
027 auto quick perms
028 auto copyup quick
+029 auto quick
--
1.8.3.1