#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Omar Sandoval.  All Rights Reserved.
#
# FS QA Test 089
#
# Test deleting the default subvolume, making sure that submounts under it are
# not unmounted prematurely. This is a regression test for Linux commit "Btrfs:
# don't invalidate root dentry when subvolume deletion fails".
#
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
. ./common/filter.btrfs

# real QA test starts here

# Modify as appropriate.
_supported_fs btrfs
_supported_os Linux
_require_scratch

rm -f $seqres.full

_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount

# Create a new subvolume and make it the default subvolume.
$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/testvol" >>$seqres.full 2>&1 \
	|| _fail "couldn't create subvol"
testvol_id=$(_btrfs_get_subvolid "$SCRATCH_MNT" testvol)
$BTRFS_UTIL_PROG subvolume set-default $testvol_id "$SCRATCH_MNT" >>$seqres.full 2>&1 \
	|| _fail "couldn't set default"

# Bind-mount a directory under the default subvolume.
mkdir "$SCRATCH_MNT/testvol/testdir"
mkdir "$SCRATCH_MNT/testvol/mnt"
mount --bind "$SCRATCH_MNT/testvol/testdir" "$SCRATCH_MNT/testvol/mnt"

# Now attempt to delete the default subvolume.
$BTRFS_UTIL_PROG subvolume delete "$SCRATCH_MNT/testvol" >>$seqres.full 2>&1

# Unmount the bind mount, which should still be alive.
$UMOUNT_PROG "$SCRATCH_MNT/testvol/mnt"

echo "Silence is golden"
status=0
exit