#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Red Hat Inc.  All Rights Reserved.
#
# FS QA Test 411
#
# This test cover linux commit 7ae8fd0, kernel two mnt_group_id == 0
# (no peer)vfsmount as peers. It case kernel dereference a NULL
# address.
#
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.*
	_clear_mount_stack
	# make sure there's no bug cause dentry isn't be freed
	rm -rf $MNTHEAD
}

# 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 generic
_require_test
_require_scratch
_require_local_device $SCRATCH_DEV

fs_stress()
{
	local target=$1

	$FSSTRESS_PROG -z -n 500 -p 5 \
		       -f creat=5 \
		       -f mkdir=5 \
		       -f dwrite=1 \
		       -f dread=1 \
		       -f link=2 \
		       -f rename=1 \
		       -f rmdir=2 \
		       -f unlink=1 \
		       -f symlink=1 \
		       -f write=1 \
		       -f read=1 \
		       -f chown=1 \
		       -f getdents=1 \
		       -f fiemap=1 \
		       -d $target >/dev/null
	sync
}

# prepare some mountpoint dir
MNTHEAD=$TEST_DIR/$seq
rm -rf $MNTHEAD
mkdir $MNTHEAD 2>>$seqres.full
mpA=$MNTHEAD/"$$"_mpA
mpB=$MNTHEAD/"$$"_mpB
mpC=$MNTHEAD/"$$"_mpC

find_mnt()
{
	echo "------"
	findmnt -n -o TARGET,SOURCE $SCRATCH_DEV | \
		sed -e "s;$mpA;mpA;g" \
		    -e "s;$mpB;mpB;g" \
		    -e "s;$mpC;mpC;g" | \
		_filter_spaces | _filter_testdir_and_scratch | sort
	echo "======"
}

start_test()
{
	local type=$1

	_scratch_mkfs >$seqres.full 2>&1
	_get_mount -t $FSTYP $SCRATCH_DEV $MNTHEAD
	$MOUNT_PROG --make-"${type}" $MNTHEAD
	mkdir $mpA $mpB $mpC
}

end_test()
{
	_clear_mount_stack
	rm -rf $mpA $mpB $mpC
}

#
#            shared            New FS           shared
#      -----------------------[A/mnt1]----------------------
#     |                           |                         |
#     |                bind       |    bind                 |       New FS
# [C/mnt1]--[slave C]<------[shared A]------>[slave B]--[B/mnt1]--[B/mnt1/mnt2]
#
crash_test()
{
	start_test shared

	_get_mount -t $FSTYP $SCRATCH_DEV $mpA
	mkdir $mpA/mnt1
	$MOUNT_PROG --make-shared $mpA
	_get_mount --bind $mpA $mpB
	_get_mount --bind $mpA $mpC
	$MOUNT_PROG --make-slave $mpB
	$MOUNT_PROG --make-slave $mpC
	_get_mount -t $FSTYP $SCRATCH_DEV $mpA/mnt1
	mkdir $mpA/mnt1/mnt2

	_get_mount -t $FSTYP $SCRATCH_DEV $mpB/mnt1/mnt2
	find_mnt
	fs_stress $mpB/mnt1/mnt2

	end_test
	echo "crash test passed"
}

crash_test

# success, all done
status=0
exit