#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2020 Facebook.  All Rights Reserved.
#
# FS QA Test 219
#
# Test a variety of stale device usecases.  We cache the device and generation
# to make sure we do not allow stale devices, which can end up with some wonky
# behavior for loop back devices.
# And, added a few other test cases so it's clear what we expect to happen
# currently.
#

. ./common/preamble
_begin_fstest auto quick volume

# Override the default cleanup function.
_cleanup()
{
	cd /
	rm -f $tmp.*

	# The variables are set before the test case can fail.
	$UMOUNT_PROG ${loop_mnt1} &> /dev/null
	$UMOUNT_PROG ${loop_mnt2} &> /dev/null
	rm -rf $loop_mnt1
	rm -rf $loop_mnt2

	[ ! -z $loop_dev1 ] && _destroy_loop_device $loop_dev1
	[ ! -z $loop_dev1 ] && _destroy_loop_device $loop_dev2

	rm -f $fs_img1
	rm -f $fs_img2

	_btrfs_rescan_devices
}

. ./common/filter

_supported_fs btrfs

loop_mnt1=$TEST_DIR/$seq/mnt1
loop_mnt2=$TEST_DIR/$seq/mnt2
fs_img1=$TEST_DIR/$seq/img1
fs_img2=$TEST_DIR/$seq/img2
loop_dev1=""
loop_dev2=""

_require_test
_require_loop
_require_btrfs_fs_sysfs
_require_btrfs_forget_or_module_loadable
_fixed_by_kernel_commit 5f58d783fd78 \
	"btrfs: free device in btrfs_close_devices for a single device filesystem"

mkdir -p $loop_mnt1
mkdir -p $loop_mnt2

$XFS_IO_PROG -f -c "truncate 256m" $fs_img1 >>$seqres.full 2>&1

_mkfs_dev $fs_img1 >>$seqres.full 2>&1
cp $fs_img1 $fs_img2

loop_dev1=`_create_loop_device $fs_img1`
loop_dev2=`_create_loop_device $fs_img2`

# Normal single device case, should pass just fine
_mount $loop_dev1 $loop_mnt1 > /dev/null  2>&1 || \
	_fail "Couldn't do initial mount"
$UMOUNT_PROG $loop_mnt1

_btrfs_forget_or_module_reload

# Now mount the new version again to get the higher generation cached, umount
# and try to mount the old version.  Mount the new version again just for good
# measure.
_mount $loop_dev1 $loop_mnt1 > /dev/null 2>&1 || \
	_fail "Failed to mount the second time"
$UMOUNT_PROG $loop_mnt1

_mount $loop_dev2 $loop_mnt2 > /dev/null 2>&1 || \
	_fail "We couldn't mount the old generation"
$UMOUNT_PROG $loop_mnt2

_mount $loop_dev1 $loop_mnt1 > /dev/null 2>&1 || \
	_fail "Failed to mount the second time"
$UMOUNT_PROG $loop_mnt1

# Now try mount them at the same time, if kernel does not support
# temp-fsid feature then mount will fail.
_btrfs_forget_or_module_reload

_mount $loop_dev1 $loop_mnt1 > /dev/null 2>&1 || \
	_fail "Failed to mount the third time"
if ! _has_btrfs_sysfs_feature_attr temp_fsid; then
	_mount $loop_dev2 $loop_mnt2 > /dev/null 2>&1 && \
		_fail "We were allowed to mount when we should have failed"
fi

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