#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Oracle, Inc.  All rights reserved.
#
# FS QA Test No. 450
#
# Make sure that the statfs b_avail counter doesn't change across remount
# after the rmapbt has grown in size.
#
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

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

# real QA test starts here
_supported_fs xfs
_require_xfs_io_command "falloc"
_require_test_program "punch-alternating"
_require_xfs_scratch_rmapbt

_scratch_mkfs >> $seqres.full
_scratch_mount

# Make sure we allocate a big enough file such that punching out every other
# block will cause the rmapbt to expand by at least one block.
blksz=$(_get_file_block_size $SCRATCH_MNT)
nr_rmap_per_rmapbt=$(( (blksz - 56) / 24))
blks=$(( (nr_rmap_per_rmapbt + 2) * 2))
$XFS_IO_PROG -f -c "falloc 0 $((blks * blksz))" $SCRATCH_MNT/a >> $seqres.full
$here/src/punch-alternating $SCRATCH_MNT/a

# Do the stat counters change across the remount?
before=$(stat -f -c '%b %f' $SCRATCH_MNT)
_scratch_cycle_mount
after=$(stat -f -c '%b %f' $SCRATCH_MNT)

if [ "${before}" != "${after}" ]; then
	echo "counters changed: ${before} ${after}"
	echo "before: ${before}" >> $seqres.full
	echo "after: ${after}" >> $seqres.full
fi

echo "Silence is golden."

# success, all done
status=0
exit