#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Fujitsu. All Rights Reserved.
#
# FS QA Test No. 165
#
# QA test that checks rmdir(2) works for subvolumes like ordinary directories.
#
# This behavior has been restricted long time but becomes allowed by kernel
# commit a79a464d5675 ("btrfs: Allow rmdir(2) to delete an empty subvolume")
#
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.*
}

create_subvol()
{
	$BTRFS_UTIL_PROG subvolume create $1 >> $seqres.full 2>&1
}

create_snapshot()
{
	$BTRFS_UTIL_PROG subvolume snapshot $@ >> $seqres.full 2>&1
}

rmdir_subvol()
{
	rmdir $1 >> $seqres.full 2>&1
}

rm_r_subvol() {
	rm -r $1 >> $seqres.full 2>&1
}

# 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 btrfs
_require_scratch
_require_btrfs_fs_feature "rmdir_subvol"

_scratch_mkfs > /dev/null 2>&1 || _fail "mkfs failed"
_scratch_mount

# Check that an empty subvolume can be deleted by rmdir
create_subvol $SCRATCH_MNT/sub1
rmdir_subvol $SCRATCH_MNT/sub1 || \
	echo "rmdir should delete an empty subvolume"

# Check that non-empty subvolume cannot be deleted by rmdir
create_subvol $SCRATCH_MNT/sub2
touch $SCRATCH_MNT/sub2/file
rmdir_subvol $SCRATCH_MNT/sub2 && \
	echo "rmdir should fail for non-empty subvolume"
rm $SCRATCH_MNT/sub2/file
rmdir_subvol $SCRATCH_MNT/sub2 || \
	echo "rmdir should delete an empty subvolume"

# Check that read-only empty subvolume can be deleted by rmdir
create_subvol $SCRATCH_MNT/sub3
create_snapshot -r $SCRATCH_MNT/sub3 $SCRATCH_MNT/snap
$BTRFS_UTIL_PROG property set $SCRATCH_MNT/sub3 ro true >> $seqres.full 2>&1
rmdir_subvol $SCRATCH_MNT/sub3 || \
	echo "rmdir should delete an empty subvolume"
rmdir_subvol $SCRATCH_MNT/snap || \
	echo "rmdir should delete a readonly empty subvolume"

# Check that the default subvolume cannot be deleted by rmdir
create_subvol $SCRATCH_MNT/sub4
subvolid=$(_btrfs_get_subvolid $SCRATCH_MNT sub4)
$BTRFS_UTIL_PROG subvolume set-default $subvolid $SCRATCH_MNT \
	>> $seqres.full 2>&1
rmdir_subvol $SCRATCH_MNT/sub4 && \
	echo "rmdir should fail for the default subvolume"

# Check that subvolume stub (created by snapshot) can be deleted by rmdir
# (Note: this has been always allowed)
create_subvol $SCRATCH_MNT/sub5
create_subvol $SCRATCH_MNT/sub5/sub6
create_snapshot $SCRATCH_MNT/sub5 $SCRATCH_MNT/snap2
rmdir $SCRATCH_MNT/snap2/sub6 || \
	echo "rmdir should delete a subvolume stub (ino number == 2)"

# Check that rm -r works for both non-snapshot subvolume and snapshot
create_subvol $SCRATCH_MNT/sub7
mkdir $SCRATCH_MNT/sub7/dir
create_subvol $SCRATCH_MNT/sub7/dir/sub8
touch $SCRATCH_MNT/sub7/dir/sub8/file

create_snapshot $SCRATCH_MNT/sub7 $SCRATCH_MNT/snap3
create_snapshot -r $SCRATCH_MNT/sub7 $SCRATCH_MNT/snap4

rm_r_subvol $SCRATCH_MNT/sub7 || \
	echo "rm -r should delete subvolumes recursively"
rm_r_subvol $SCRATCH_MNT/snap3 || \
	echo "rm -r should delete subvolumes recursively"
rm_r_subvol $SCRATCH_MNT/snap4 && \
	echo "rm -r should fail for non-empty readonly subvolume"

$BTRFS_UTIL_PROG property set $SCRATCH_MNT/snap4 ro false >> $seqres.full 2>&1
rm_r_subvol $SCRATCH_MNT/snap4 || \
	echo "rm -r should delete subvolumes recursively"

# success, all done
echo "Silence is golden"
status=0
exit