#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Oracle. All Rights Reserved.
#
# FS QA Test 185
#
# Fuzzy test for FS image duplication.
#  Could be fixed by
#  a9261d4125c9 ("btrfs: harden agaist duplicate fsid on scanned devices")
#
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

mnt=$TEST_DIR/$seq.mnt
_cleanup()
{
	rm -rf $mnt > /dev/null 2>&1
	cd /
	rm -f $tmp.*
}

# 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_dev_pool 2
_scratch_dev_pool_get 2

device_1=$(echo $SCRATCH_DEV_POOL | awk '{print $1}')
device_2=$(echo $SCRATCH_DEV_POOL | awk '{print $2}')

echo device_1=$device_1 device_2=$device_2 >> $seqres.full

rm -rf $mnt > /dev/null 2>&1
mkdir $mnt
_mkfs_dev $device_1
_mount $device_1 $mnt

[[ $(findmnt $mnt | grep -v TARGET | awk '{print $2}') != $device_1 ]] && \
						_fail "mounted device changed"

for sb_bytenr in 65536 67108864; do
	echo -n "dd status=none if=$dev_foo of=$dev_bar bs=1 "\
		"seek=$sb_bytenr skip=$sb_bytenr count=4096" >> $seqres.full
	dd status=none if=$device_1 of=$device_2 bs=1 seek=$sb_bytenr \
				skip=$sb_bytenr count=4096 > /dev/null 2>&1
	echo ..:$? >> $seqres.full
done

# Original device is mounted, scan of its clone should fail
$BTRFS_UTIL_PROG device scan $device_2 >> $seqres.full 2>&1
[[ $? != 1 ]] && _fail "cloned device scan should fail"

[[ $(findmnt $mnt | grep -v TARGET | awk '{print $2}') != $device_1 ]] && \
						_fail "mounted device changed"

# Original device scan should be successful
$BTRFS_UTIL_PROG device scan $device_1 >> $seqres.full 2>&1
[[ $? != 0 ]] && \
	_fail "if it fails here, then it means subvolume mount at boot may fail "\
	      "in some configs."

$UMOUNT_PROG $mnt > /dev/null 2>&1
_scratch_dev_pool_put

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