#! /bin/bash
# FS QA Test No. 172
#
# Reflink a file that uses more than half of the space, then try to observe
# ENOSPC while copy-on-writing the file via the page cache.
#
#-----------------------------------------------------------------------
# Copyright (c) 2015, 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.* $testdir1
}

# 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 "Reformat with appropriate size"
umount $SCRATCH_MNT

file_size=$((168 * 1024 * 1024))
fs_size=$((256 * 1024 * 1024))
_scratch_mkfs_sized $fs_size >> $seqres.full 2>&1
_scratch_mount >> $seqres.full 2>&1
rm -rf $testdir
mkdir $testdir

echo "Create a big file and reflink it"
_pwrite_byte 0x61 0 $file_size $testdir/bigfile >> $seqres.full 2>&1
_cp_reflink $testdir/bigfile $testdir/clonefile
sync

echo "Allocate the rest of the space"
touch $testdir/file0 $testdir/file1
_pwrite_byte 0x61 0 $fs_size $testdir/eat_my_space >> $seqres.full 2>&1
sync

echo "CoW the big file"
out="$(_pwrite_byte 0x62 0 $file_size $testdir/bigfile 2>&1)"
echo ${out} | grep -q "No space left on device" || echo "CoW should have failed with ENOSPC"
echo ${out} >> $seqres.full 2>&1
echo ${out}

echo "Remount and try CoW again"
_scratch_cycle_mount

out="$(_pwrite_byte 0x62 0 $file_size $testdir/bigfile 2>&1)"
echo ${out} | grep -q "No space left on device" || echo "CoW should have failed with ENOSPC"
echo ${out} >> $seqres.full 2>&1
echo ${out}

# success, all done
status=0
exit
