#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Oracle, Inc.  All Rights Reserved.
#
# FS QA Test No. 515
#
# Ensure that reflinking into a file well beyond EOF zeroes everything between
# the old EOF and the start of the newly linked chunk.  This is an adaptation
# of a reproducer script that Eric Sandeen formulated from a stale data
# exposure bug uncovered by shared/010.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
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
. ./common/reflink

# real QA test starts here
_supported_fs generic
_supported_os Linux
_require_scratch_reflink
_require_xfs_io_command "falloc"

rm -f $seqres.full

# Fill disk with a well known pattern so that stale data exposure becomes much
# more obvious.
$XFS_IO_PROG -c "pwrite -S 0x58 -b 1m 0 300m" $SCRATCH_DEV >> $seqres.full
_scratch_mkfs_sized $((300 * 1048576)) >>$seqres.full 2>&1
_scratch_mount

DONOR1=$SCRATCH_MNT/a
TARGET=$SCRATCH_MNT/b
blksz=65536

$XFS_IO_PROG -f -c "pwrite -S 0x72 0 $blksz" $DONOR1 >> $seqres.full

$XFS_IO_PROG -f \
	-c "falloc -k $((blksz*2)) $blksz"        \
	-c "pwrite -S 0x57 $((blksz*16)) 8192" \
	-c "fdatasync" \
	-c 'stat' \
	-c "reflink $DONOR1 0 $((blksz*17)) $blksz" \
                $TARGET >> $seqres.full

od -tx1 -Ad -c $TARGET >> $seqres.full
md5sum $DONOR1 | _filter_scratch
md5sum $TARGET | _filter_scratch

_scratch_cycle_mount

od -tx1 -Ad -c $TARGET >> $seqres.full
md5sum $DONOR1 | _filter_scratch
md5sum $TARGET | _filter_scratch

status=0
exit