apfstests/tests/generic/358

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Oracle, Inc.  All Rights Reserved.
#
# FS QA Test No. 358
#
# Share an extent amongst a bunch of files such that the refcount
# stays the same while the rate of change of the set of owners is
# steadily increasing.  For example, an extent of 32 blocks is owned
# by 32 files.  At block 1, change one of the owners.  At block 2,
# change 2 of the owners, and so on.
#
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 7 15

_cleanup()
{
	cd /
	rm -rf $tmp.*
	wait
}

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

# real QA test starts here
_supported_os Linux
_require_scratch_reflink

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

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

blocks=64
blksz=65536

echo "Initialize file"
_pwrite_byte 0x61 0 $((blocks * blksz)) $testdir/file >> $seqres.full

echo "Share the file n-ways"
seq 1 $((blocks - 1)) | while read nr; do
	_reflink_range $testdir/file 0 $testdir/file$nr.0 0 $((nr * blksz)) >> $seqres.full
	seq $nr $((blocks - 1)) | while read nnr; do
		_reflink_range $testdir/file $((nnr * blksz)) $testdir/file$nr.$nnr $((nnr * blksz)) $blksz >> $seqres.full
	done
done
_scratch_cycle_mount

echo "Check output"
md5sum $testdir/file $testdir/file*.0 | _filter_scratch

# success, all done
status=0
exit