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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 CTERA Networks. All Rights Reserved.
#
# FSQA Test No. 067
#
# Test unique st_dev;st_ino on non-samefs setup.
#
# Check that files from middle layer on same fs as upper layer
# are not allowed to export the real inode st_dev;st_ino.
#
# This is a regression test for kernel commit:
# 9c6d8f13e9da ovl: fix corner case of non-unique st_dev;st_ino
#
. ./common/preamble
_begin_fstest auto quick copyup nonsamefs
# Import common functions.
. ./common/filter
# real QA test starts here
_supported_fs overlay
_fixed_by_kernel_commit 9c6d8f13e9da \
"ovl: fix corner case of non-unique st_dev;st_ino"
# Use non-default scratch underlying overlay dirs, we need to check
# them explicity after test.
_require_scratch_nocheck
_require_test
# Lower is on test partition
lower=$OVL_BASE_TEST_DIR/$OVL_LOWER-$seq
# Upper/work are on scratch partition
middle=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
upper=$OVL_BASE_SCRATCH_MNT/$OVL_UPPER
work=$OVL_BASE_SCRATCH_MNT/$OVL_WORK
rm -rf $lower
mkdir $lower
_scratch_mkfs >>$seqres.full 2>&1
realfile=$middle/file
testfile=$SCRATCH_MNT/file
# Create a file on middle layer on same fs as upper layer
echo wrong > $realfile
# Mount an overlay on $SCRATCH_MNT with lower layer on test partition
# and middle and upper layer on scratch partition.
# Disable xino, so not all overlay inodes are on the same st_dev.
_overlay_scratch_mount_dirs $middle:$lower $upper $work -o xino=off || \
_notrun "cannot mount overlay with xino=off option"
stat $realfile >>$seqres.full
stat $testfile >>$seqres.full
# Diverge the content of the overlay file from its origin
echo right > $testfile
stat $testfile >>$seqres.full
# Expect the overlay file to differ from the original lower file
diff -q $realfile $testfile >>$seqres.full &&
echo "diff with middle layer file doesn't know right from wrong! (warm cache)"
echo 3 > /proc/sys/vm/drop_caches
stat $testfile >>$seqres.full
# Expect the overlay file to differ from the original lower file
diff -q $realfile $testfile >>$seqres.full &&
echo "diff with middle layer file doesn't know right from wrong! (cold cache)"
$UMOUNT_PROG $SCRATCH_MNT
# check overlayfs
_overlay_check_scratch_dirs $middle:$lower $upper $work -o xino=off
echo "Silence is golden"
status=0
exit
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