tests/generic/409

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Red Hat Inc.  All Rights Reserved.
#
# FS QA Test 409
#
# Test mount shared subtrees, verify the bind semantics:
#
# ---------------------------------------------------------------------------
# |         BIND MOUNT OPERATION                                            |
# |**************************************************************************
# |source(A)->| shared       |       private  |       slave    | unbindable |
# | dest(B)  |               |                |                |            |
# |   |      |               |                |                |            |
# |   v      |               |                |                |            |
# |**************************************************************************
# |  shared  | shared        |     shared     | shared & slave |  invalid   |
# |          |               |                |                |            |
# |non-shared| shared        |      private   |      slave     |  invalid   |
# ***************************************************************************
#
. ./common/preamble
_begin_fstest auto quick mount

# Override the default cleanup function.
_cleanup()
{
	_kill_fsstress
	_clear_mount_stack
	# make sure there's no bug cause dentry isn't be freed
	rm -rf $MNTHEAD
	cd /
	rm -f $tmp.*
}

# Import common functions.
. ./common/filter

_require_test
_require_scratch
_require_local_device $SCRATCH_DEV

fs_stress()
{
	local target=$1

	_run_fsstress -z -n 50 -p 3 \
		       -f creat=5 \
		       -f mkdir=5 \
		       -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
	_sync_fs $target
}

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

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" \
		    -e "s;$mpD;mpD;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 $mpD
}

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

bind_run()
{
	local source=$1
	local dest=$2

	start_test $dest

	echo "bind $source on $dest"
	_get_mount -t $FSTYP $SCRATCH_DEV $mpA
	mkdir -p $mpA/dir 2>/dev/null
	$MOUNT_PROG --make-shared $mpA
	_get_mount --bind $mpA $mpB
	$MOUNT_PROG --make-"$source" $mpB
	# maybe unbindable at here
	_get_mount --bind $mpB $mpC 2>/dev/null
	if [ $? -ne 0 ]; then
		find_mnt
		end_test
		return 0
	fi
	_get_mount --bind $mpC $mpD
	for m in $mpA $mpB $mpC $mpD; do
		_get_mount -t $FSTYP $SCRATCH_DEV $m/dir
		fs_stress $m/dir
		find_mnt
		_put_mount
	done

	end_test
}

bind_test()
{
        #        source     dest
	bind_run shared     shared
	bind_run slave      shared
	bind_run private    shared
	bind_run unbindable shared

	bind_run shared     slave
	bind_run slave      slave
	bind_run private    slave
	bind_run unbindable slave

	bind_run shared     private
	bind_run slave      private
	bind_run private    private
	bind_run unbindable private
}

bind_test

# success, all done
status=0
exit