#! /bin/bash
# FS QA Test No. 297
#
# See how well reflink handles ^C in the middle of a slow reflink.
#
#-----------------------------------------------------------------------
# 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.* $TEST_DIR/before $TEST_DIR/after
}

# 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
_require_command "$(which timeout)" "timeout"

test $FSTYP == "nfs"  && _notrun "NFS can't interrupt clone operations"

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="$(stat -f $testdir -c '%S')"
_pwrite_byte 0x61 0 $blksz $testdir/file1 >> $seqres.full

fnr=26		# 2^26 reflink extents should be enough to find a slow op?
timeout=8	# guarantee a good long run...
echo "Find a reflink size that takes a long time"
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))
	touch $TEST_DIR/before
	$XFS_IO_PROG -f -c "reflink $testdir/file1 0 $n $n" $testdir/file1 >> $seqres.full 2>&1
	touch $TEST_DIR/after
	before=$(stat -c '%Y' $TEST_DIR/before)
	after=$(stat -c '%Y' $TEST_DIR/after)
	delta=$((after - before))
	test $delta -gt $timeout && break
done

echo "Try to kill reflink after a shorter period of time"
kill_after=2	# give us a shorter time to die
n=$(stat -c '%s' $testdir/file1)
echo "performing kill test on $n bytes..." >> $seqres.full
touch $TEST_DIR/before
timeout -s INT ${kill_after}s $XFS_IO_PROG -f -c "reflink $testdir/file1 0 $n $n" $testdir/file1 >> $seqres.full 2>&1
touch $TEST_DIR/after
before=$(stat -c '%Y' $TEST_DIR/before)
after=$(stat -c '%Y' $TEST_DIR/after)
delta=$((after - before))
echo "reflink of $n bytes took $delta seconds" >> $seqres.full
test $delta -gt $timeout && _fail "reflink didn't stop in time, n=$n t=$delta"

echo "Check scratch fs"
sleep 2		# give it a few seconds to actually die...

# success, all done
status=0
exit