This is a test for whiteout inode sharing feature.
Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxxxx>
---
v1->v2:
- Address Amir's comments in v1.
common/module | 9 +++
tests/overlay/072 | 148 ++++++++++++++++++++++++++++++++++++++++++
tests/overlay/072.out | 2 +
tests/overlay/group | 1 +
4 files changed, 160 insertions(+)
create mode 100755 tests/overlay/072
create mode 100644 tests/overlay/072.out
diff --git a/common/module b/common/module
index 39e4e793..148e8c8f 100644
--- a/common/module
+++ b/common/module
@@ -81,3 +81,12 @@ _get_fs_module_param()
{
cat /sys/module/${FSTYP}/parameters/${1} 2>/dev/null
}
+ # Set the value of a filesystem module parameter
+ # at /sys/module/$FSTYP/parameters/$PARAM
+ #
+ # Usage example:
+ # _set_fs_module_param param value
+ _set_fs_module_param()
+{
+ echo ${2} > /sys/module/${FSTYP}/parameters/${1} 2>/dev/null
+}
diff --git a/tests/overlay/072 b/tests/overlay/072
new file mode 100755
index 00000000..e1244394
--- /dev/null
+++ b/tests/overlay/072
@@ -0,0 +1,148 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2020 Chengguang Xu <cgxu519@xxxxxxxxxxxx>.
+# All Rights Reserved.
+#
+# FS QA Test 072
+#
+# This is a test for whiteout inode sharing feature.
+#
+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.*
+ _set_fs_module_param $param_name $orig_param_value
+}
+
+# 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_test
+_require_scratch
+
+param_name="whiteout_link_max"
+
+# Check overlayfs module param(whiteout_link_max)
+check_whiteout_link_max()
+{
+ orig_param_value=`_get_fs_module_param ${param_name}`
+ if [ -z ${orig_param_value} ]; then
+ _notrun "${FSTYP} does not support whiteout inode sharing"
+ fi
+}
+
+lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
+upperdir=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
+workdir=$OVL_BASE_SCRATCH_MNT/$OVL_WORK
+
+# Make some testing files in lowerdir.
+# Argument:
+# $1: Testing file number
+make_lower_files()
+{
+ for name in `seq -s' ' ${1}`
+ do
+ touch $lowerdir/file${name} 1>&2 2>/dev/null
+ done
+}
+
+# Delete all copy-uped files in upperdir.
+make_whiteout_files()
+{
+ rm -f $SCRATCH_MNT/* 1>&2 2>/dev/null
+}
+
+# Check link count of whiteout files.
+# Arguments:
+# $1: Testing file number
+# $2: Expected link count
+check_whiteout_files()
+{
+ for name in `seq -s' ' ${1}`
+ do
+ local real_count=`stat -c %h $upperdir/file${name} 2>/dev/null`
+ if [[ ${2} != $real_count ]]; then
+ echo "Expected link count is ${2} but real count is $real_count, file name is file${name}"
+ fi
+ done
+ local tmpfile_count=`ls $workdir/work/\#* $workdir/index/\#* 2>/dev/null |wc -l 2>/dev/null`
+ if [[ -n $tmpfile_count && $tmpfile_count > 1 ]]; then
+ echo "There are more than one whiteout tmpfile in work/index dir!"
+ ls -l $workdir/work/\#* $workdir/index/\#* 2>/dev/null
+ fi
+}
+
+# Run test case with specific arguments.
+# Arguments:
+# $1: Maximum link count
+# $2: Testing file number
+# $3: Expected link count
+run_test_case()
+{
+ _scratch_mkfs
+ _set_fs_module_param $param_name ${1}
+ make_lower_files ${2}
+ _scratch_mount
+ make_whiteout_files
+ check_whiteout_files ${2} ${3}
+ _scratch_unmount
+}
+
+check_whiteout_link_max
+
+# Case1:
+# Setting whiteout_link_max=0 means whiteout files will not
+# share inode, each whiteout file will have it's own inode.
+
+link_max=0
+file_count=10
+link_count=1
+run_test_case $link_max $file_count $link_count
+
+# Case2:
+# Setting whiteout_link_max=0 means whiteout files will not
+# share inode, each whiteout file will have it's own inode.
+
+link_max=1
+file_count=10
+link_count=1
+run_test_case $link_max $file_count $link_count
+
+# Case3:
+# Setting whiteout_link_max>2 means whiteout files will share
+# inode and link count could up to whiteout_link_max.
+
+link_max=2
+file_count=10
+link_count=2
+run_test_case $link_max $file_count $link_count
+
+# Case4:
+# Setting whiteout_link_max>2 means whiteout files will share
+# inode and link count could up to whiteout_link_max.
+
+link_max=10
+file_count=20
+link_count=10
+run_test_case $link_max $file_count $link_count
+
+# success, all done
+echo "Silence is golden"
+status=0
+exit
diff --git a/tests/overlay/072.out b/tests/overlay/072.out
new file mode 100644
index 00000000..590bbc6c
--- /dev/null
+++ b/tests/overlay/072.out
@@ -0,0 +1,2 @@
+QA output created by 072
+Silence is golden
diff --git a/tests/overlay/group b/tests/overlay/group
index 43ad8a52..8b2276f1 100644
--- a/tests/overlay/group
+++ b/tests/overlay/group
@@ -74,3 +74,4 @@
069 auto quick copyup hardlink exportfs nested nonsamefs
070 auto quick copyup redirect nested
071 auto quick copyup redirect nested nonsamefs
+072 auto quick whiteout
--
2.20.1
