#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2019 SUSE Linux Products GmbH.  All Rights Reserved.
#
# FS QA Test 190
#
# A general test to validate that balance and qgroups work correctly when
# balance needs to be resumed on mount.
#
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.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter
. ./common/dmlogwrites

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs btrfs
_supported_os Linux
_require_scratch
# and we need extra device as log device
_require_log_writes

nr_files=512				# enough metadata to bump tree height
file_size=2048				# small enough to be inlined

_log_writes_init $SCRATCH_DEV
_log_writes_mkfs >> $seqres.full 2>&1

_log_writes_mount
$BTRFS_UTIL_PROG quota enable $SCRATCH_MNT >> $seqres.full
$BTRFS_UTIL_PROG quota rescan -w $SCRATCH_MNT >> $seqres.full

# Create enough metadata for later balance
for ((i = 0; i < $nr_files; i++)); do
	_pwrite_byte 0xcd 0 $file_size $SCRATCH_MNT/file_$i > /dev/null
done

# Flush delalloc so that balance has work to do.
sync

# Balance metadata so we will have at least one transaction committed with
# valid reloc tree, and hopefully another commit with orphan reloc tree.
$BTRFS_UTIL_PROG balance start -f -m $SCRATCH_MNT >> $seqres.full
_log_writes_unmount
_log_writes_remove

cur=$(_log_writes_find_next_fua 0)
echo "cur=$cur" >> $seqres.full
while [ ! -z "$cur" ]; do
	_log_writes_replay_log_range $cur $SCRATCH_DEV >> $seqres.full

	# Test that no crashes happen or any other kind of failure.
	_scratch_mount
	_scratch_unmount

	# Don't trigger fsck here, as relocation get paused,
	# at that transistent state, qgroup number may differ
	# and cause false alert.

	prev=$cur
	cur=$(_log_writes_find_next_fua $(($cur + 1)))
	[ -z "$cur" ] && break
done

# Now the fs has finished its balance and qgroup should be consistent.
# Fstest will automatically check the fs and btrfs check will report
# any qgroup inconsistent if something went wrong.

echo "Silence is golden"

# success, all done
status=0
exit