On Wed, May 06, 2020 at 06:15:28PM +0800, Chengguang Xu wrote: > This is a test for whiteout inode sharing feature. > > Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxxxx> > --- > v1->v2: > - Address Amir's comments in v1 > > v2->v3: > - Address Amir's comments in v2 > > v3->v4: > - Fix test case based on latest kernel patch(removed module param) > https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git/commit/?h=overlayfs-next&id=4e49695244661568130bfefcb6143dd1eaa3d8e7 > > tests/overlay/073 | 106 ++++++++++++++++++++++++++++++++++++++++++ > tests/overlay/073.out | 2 + > tests/overlay/group | 1 + > 3 files changed, 109 insertions(+) > create mode 100755 tests/overlay/073 > create mode 100644 tests/overlay/073.out > > diff --git a/tests/overlay/073 b/tests/overlay/073 > new file mode 100755 > index 00000000..fc847092 > --- /dev/null > +++ b/tests/overlay/073 > @@ -0,0 +1,106 @@ > +#! /bin/bash > +# SPDX-License-Identifier: GPL-2.0 > +# Copyright (c) 2020 Chengguang Xu <cgxu519@xxxxxxxxxxxx>. > +# All Rights Reserved. > +# > +# FS QA Test 073 > +# > +# Test whiteout inode sharing functionality. > +# > +# A "whiteout" is an object that has special meaning in overlayfs. > +# A whiteout on an upper layer will effectively hide a matching file > +# in the lower layer, making it appear as if the file didn't exist. > +# > +# Whiteout inode sharing means multiple whiteout objects will share > +# one inode in upper layer, without this feature every whiteout object > +# will consume one inode in upper layer. > + > +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 $seqres.full > + > +# real QA test starts here > +_supported_fs overlay > +_supported_os Linux > +_require_scratch I see no feature detection logic, so test just fails on old kernels without this feature? I tried with v5.7-r4 kernel, test fails because each whiteout file has only one hardlink. Thanks, Eryu > + > +lowerdir=$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 ${1}`; do > + touch $lowerdir/file${name} &>/dev/null > + done > +} > + > +# Delete all copy-uped files in upperdir. > +make_whiteout_files() > +{ > + rm -f $SCRATCH_MNT/* &>/dev/null > +} > + > +# Check link count of whiteout files. > +# Arguments: > +# $1: Testing file number > +# $2: Expected link count > +check_whiteout_files() > +{ > + for name in `seq ${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: Testing file number > +# $2: Expected link count > +run_test_case() > +{ > + _scratch_mkfs > + make_lower_files ${1} > + _scratch_mount > + make_whiteout_files > + check_whiteout_files ${1} ${2} > + _scratch_unmount > +} > + > +#Test case > +file_count=10 > +link_count=11 > +run_test_case $file_count $link_count > + > +# success, all done > +echo "Silence is golden" > +status=0 > +exit > diff --git a/tests/overlay/073.out b/tests/overlay/073.out > new file mode 100644 > index 00000000..590bbc6c > --- /dev/null > +++ b/tests/overlay/073.out > @@ -0,0 +1,2 @@ > +QA output created by 073 > +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 @@ > 070 auto quick copyup redirect nested > 071 auto quick copyup redirect nested nonsamefs > 072 auto quick copyup hardlink > +073 auto quick whiteout > -- > 2.20.1 >
