#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015, Oracle and/or its affiliates.  All Rights Reserved.
#
# FS QA Test No. 151
#
# Ensure that deleting all copies of a file reflinked N times releases the blocks
#   - Record fs block usage (0)
#   - Create a file and some reflink copies
#   - Record fs block usage (1)
#   - Delete some copies of the file
#   - Record fs block usage (2)
#   - Delete all copies of the file
#   - Compare fs block usage to (2), (1), and (0)
#
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 -rf $tmp.* $testdir
}

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

# real QA test starts here
_require_test_reflink
_require_cp_reflink

rm -f $seqres.full

testdir=$TEST_DIR/test-$seq
rm -rf $testdir
mkdir $testdir

echo "Create the original file blocks"
blksz="$(_get_block_size $testdir)"
blks=2000
margin='15%'
sz=$((blksz * blks))
free_blocks0=$(stat -f $testdir -c '%f')
nr=7
filesize=$((blksz * nr))
_pwrite_byte 0x61 0 $sz $testdir/file1 >> $seqres.full
sync

echo "Create the reflink copies"
for i in `seq 2 $nr`; do
	_cp_reflink $testdir/file1 $testdir/file.$i
done
_cp_reflink $testdir/file1 $testdir/survivor
_test_cycle_mount
free_blocks1=$(stat -f $testdir -c '%f')

echo "Delete most of the files"
rm -rf $testdir/file*
_test_cycle_mount
free_blocks2=$(stat -f $testdir -c '%f')

echo "Delete all the files"
rm -rf $testdir/*
_test_cycle_mount
free_blocks3=$(stat -f $testdir -c '%f')
#echo $free_blocks0 $free_blocks1 $free_blocks2 $free_blocks3

_within_tolerance "free blocks after reflink" $free_blocks1 $((free_blocks0 - blks)) $margin -v

_within_tolerance "free blocks after deleting some reflink copies" $free_blocks2 $free_blocks1 $margin -v

_within_tolerance "free blocks after deleting all copies" $free_blocks3 $free_blocks0 $margin -v

# success, all done
status=0
exit