tests/generic/387

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Fujitsu.  All Rights Reserved.
#
# FS QA Test 387
#
# Create a heavily reflinked file, then check whether we can truncate
# it correctly.
#
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 -f $tmp.*
}

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

# remove previous $seqres.full before test
rm -f $seqres.full

# Modify as appropriate.
_supported_fs generic
_require_scratch_reflink

#btrfs needs 256mb to create default blockgroup fs
_scratch_mkfs_sized $((256 * 1024 * 1024)) >> $seqres.full 2>&1
_scratch_mount

testfile=$SCRATCH_MNT/testfile
dummyfile=$SCRATCH_MNT/dummyfile
blocksize=$((128 * 1024))

# create a dummy file, which is used to occupy some fs space first.
_pwrite_byte 0xcdcdcdcd 0 $((1 * 1024 * 1024)) $dummyfile > /dev/null
_pwrite_byte 0xcdcdcdcd 0 $blocksize  $testfile > /dev/null

echo "Silence is golden"
for ((i = 0; i < 16384; i++)); do
	_reflink_range $testfile 0 $testfile $(($i * $blocksize)) \
		$blocksize > /dev/null 2>&1
done

# consume all remaining free space
dd if=/dev/zero of=$SCRATCH_MNT/space >/dev/null 2>&1
sync

# fs is full now and fs internal operations may need some free space, for
# example, in btrfs, transaction will need to reserve space first, so here free
# 1MB space.
rm -f $dummyfile
$XFS_IO_PROG -f -c "truncate 0" $testfile

status=0
exit