Introduce a new test to demonstrate a known issue with overlayfs: - file A and B are hardlinked in lower - modify A to trigger copy up - file A is no longer a hardlink of file B There is no fix for this issue at this time. Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx> --- tests/overlay/019 | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++ tests/overlay/019.out | 2 ++ tests/overlay/group | 1 + 3 files changed, 92 insertions(+) create mode 100755 tests/overlay/019 create mode 100644 tests/overlay/019.out v2: avoid cd into $SCRATCH_MNT Eryu, Merging this test with unknown schedule for fix is up to you. I just wanted to write all the tests to cover https://github.com/amir73il/overlayfs/wiki/Non-standard-behavior and this was the last one. Anyway, I'll keep it hanging on my overlayfs-devel branch on github. Cheers, Amir. diff --git a/tests/overlay/019 b/tests/overlay/019 new file mode 100755 index 0000000..9ce945d --- /dev/null +++ b/tests/overlay/019 @@ -0,0 +1,89 @@ +#! /bin/bash +# FSQA Test No. 019 +# +# Test hardlink breakage +# +# This simple test demonstrates a known issue with overlayfs: +# - file A and B are hardlinked in lower +# - modify A to trigger copy up +# - file A is no longer a hardlink of file B +# +#----------------------------------------------------------------------- +# +# Copyright (C) 2016 CTERA Networks. All Rights Reserved. +# Author: Amir Goldstein <amir73il@xxxxxxxxx> +# +# 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" + +tmp=/tmp/$$ +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + rm -f $tmp.* +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter + +# real QA test starts here +_supported_fs overlay +_supported_os Linux +_require_scratch + +rm -f $seqres.full + +_scratch_mkfs >>$seqres.full 2>&1 + +# Create 2 hardlinked files in lower +lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR +mkdir -p $lowerdir +echo "patient zero" >> $lowerdir/foo +ln $lowerdir/foo $lowerdir/bar + + +_scratch_mount + + +rm -f $tmp.before $tmp.after + +foo=$SCRATCH_MNT/foo +bar=$SCRATCH_MNT/bar + +# Record inode number and nlink before copy up +ls -li $foo $bar | awk '{ print $1, $3 }' > $tmp.before + +# Modify content of one of the hardlinks +echo "mutated" >> $foo + +# Record inode number and nlink after copy up +ls -li $foo $bar | awk '{ print $1, $3 }' > $tmp.after + +# Compare ino/nlink before..after - expect silence +diff $tmp.before $tmp.after + +# Compare content of files - expect silence +diff $foo $bar + +echo "Silence is golden" +status=0 +exit diff --git a/tests/overlay/019.out b/tests/overlay/019.out new file mode 100644 index 0000000..163484b --- /dev/null +++ b/tests/overlay/019.out @@ -0,0 +1,2 @@ +QA output created by 019 +Silence is golden diff --git a/tests/overlay/group b/tests/overlay/group index fb6610d..f266b0a 100644 --- a/tests/overlay/group +++ b/tests/overlay/group @@ -20,3 +20,4 @@ 015 auto quick whiteout 016 auto quick copyup 018 auto quick copyup +019 auto quick copyup -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
