#! /bin/bash
# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (c) 2021 Christian Brauner <christian.brauner@ubuntu.com>
# All Rights Reserved.
#
# FS QA Test No. 632
#
# Regression test to verify that creating a series of detached mounts,
# attaching them to the filesystem, and unmounting them does not trigger an
# integer overflow in ns->mounts causing the kernel to block any new mounts in
# count_mounts() and returning ENOSPC because it falsely assumes that the
# maximum number of mounts in the mount namespace has been reached, i.e. it
# thinks it can't fit the new mounts into the mount namespace anymore.
#
# Kernel commit ee2e3f50629f ("mount: fix mounting of detached mounts onto
# targets that reside on shared mounts") fixed the bug.
#
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.*
}

. ./common/rc

rm -f $seqres.full

_supported_fs generic
_require_test
_require_test_program "detached_mounts_propagation"

$here/src/detached_mounts_propagation $TEST_DIR >> $seqres.full
status=$?

echo silence is golden
exit