tests/btrfs/219

#! /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.  This was changed with
#
#   btrfs: allow single disk devices to mount with older generations
#
# But I've added a few other test cases so it's clear what we expect to happen
# currently.
#

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 $tmp.*
	if [ ! -z "$loop_mnt" ]; then
		$UMOUNT_PROG $loop_mnt
		rm -rf $loop_mnt
	fi
	[ ! -z "$loop_mnt1" ] && rm -rf $loop_mnt1
	[ ! -z "$fs_img1" ] && rm -rf $fs_img1
	[ ! -z "$fs_img2" ] && rm -rf $fs_img2
	[ ! -z "$loop_dev" ] && _destroy_loop_device $loop_dev
	_btrfs_rescan_devices
}

# 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_test
_require_loop
_require_btrfs_forget_or_module_loadable

loop_mnt=$TEST_DIR/$seq.mnt
loop_mnt1=$TEST_DIR/$seq.mnt1
fs_img1=$TEST_DIR/$seq.img1
fs_img2=$TEST_DIR/$seq.img2

mkdir $loop_mnt
mkdir $loop_mnt1

$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

# Normal single device case, should pass just fine
_mount -o loop $fs_img1 $loop_mnt > /dev/null  2>&1 || \
	_fail "Couldn't do initial mount"
$UMOUNT_PROG $loop_mnt

_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.
loop_dev=`_create_loop_device $fs_img1`

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

_mount -o loop $fs_img2 $loop_mnt > /dev/null 2>&1 || \
	_fail "We couldn't mount the old generation"
$UMOUNT_PROG $loop_mnt

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

# Now we definitely can't mount them at the same time, because we're still tied
# to the limitation of one fs_devices per fsid.
_btrfs_forget_or_module_reload

_mount $loop_dev $loop_mnt > /dev/null 2>&1 || \
	_fail "Failed to mount the third time"
_mount -o loop $fs_img2 $loop_mnt1 > /dev/null 2>&1 && \
	_fail "We were allowed to mount when we should have failed"

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