#! /bin/bash
# FS QA Test No. 175
#
# See how well reflink handles reflinking the same block a million times.
#
#-----------------------------------------------------------------------
# Copyright (c) 2016, Oracle and/or its affiliates.  All Rights Reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------

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".*
}

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

# real QA test starts here
_supported_os Linux
_require_scratch_reflink
_require_cp_reflink

rm -f "$seqres.full"

echo "Format and mount"
_scratch_mkfs > "$seqres.full" 2>&1
_scratch_mount >> "$seqres.full" 2>&1

testdir="$SCRATCH_MNT/test-$seq"
mkdir "$testdir"

echo "Create a one block file"
blksz="$(get_block_size $testdir)"
_pwrite_byte 0x61 0 $blksz "$testdir/file1" >> "$seqres.full"

fnr=19
echo "Create extents"
truncate -s $(( (2 ** i) * blksz)) "$testdir/file1"
for i in $(seq 0 $fnr); do
	echo " ++ Reflink size $i, $((2 ** i)) blocks" >> "$seqres.full"
	n=$(( (2 ** i) * blksz))
	_reflink_range "$testdir/file1" 0 "$testdir/file1" $n $n >> "$seqres.full"
done
_scratch_cycle_mount

echo "Reflink the big file"
blks=$((2 ** (fnr + 1) ))
bytes=$((blks * blksz))
echo "reflinking $blks blocks, $bytes bytes" >> "$seqres.full"
_reflink_range "$testdir/file1" 0 "$testdir/file2" 0 $bytes >> "$seqres.full"

# success, all done
status=0
exit
