#! /bin/bash
# SPDX-License-Identifier: GPL-2.0-or-newer
# Copyright (c) 2019, Oracle and/or its affiliates.  All Rights Reserved.
#
# FS QA Test No. 578
#
# Make sure that we can handle multiple mmap writers to the same file.

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.* $testdir
}

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

# real QA test starts here
_supported_fs generic
_require_test_program "mmap-write-concurrent"
_require_command "$FILEFRAG_PROG" filefrag
_require_test_reflink
_require_cp_reflink

rm -f $seqres.full

compare() {
	for i in $(seq 1 8); do
		md5sum $testdir/file$i | _filter_test_dir
		echo $testdir/file$i >> $seqres.full
		od -tx1 -Ad -c $testdir/file$i >> $seqres.full
	done
}

testdir=$TEST_DIR/test-$seq
rm -rf $testdir
mkdir $testdir

echo "Create the original files"
blksz=65536
filesz=$((blksz * 4))
_pwrite_byte 0x61 0 $filesz $testdir/file1 >> $seqres.full
_cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
_cp_reflink $testdir/file1 $testdir/file3 >> $seqres.full
_cp_reflink $testdir/file1 $testdir/file4 >> $seqres.full
_reflink_range $testdir/file1 0 $testdir/file5 $blksz $filesz >> $seqres.full
_reflink_range $testdir/file1 0 $testdir/file6 $((blksz * 2)) $filesz >> $seqres.full
_reflink_range $testdir/file1 0 $testdir/file7 $((blksz * 3)) $filesz >> $seqres.full
_reflink_range $testdir/file1 0 $testdir/file8 $((blksz * 4)) $filesz >> $seqres.full
_test_cycle_mount

echo "Compare files before cow" | tee -a $seqres.full
compare

echo "mwrite all copies" | tee -a $seqres.full
off=$(( (filesz / 2) - 168 ))
len=337
$here/src/mmap-write-concurrent $len \
		$off $testdir/file1 \
		$off $testdir/file2 \
		$off $testdir/file3 \
		$off $testdir/file4 \
		$((off + blksz)) $testdir/file5 \
		$((off + (blksz * 2))) $testdir/file6 \
		$((off + (blksz * 3))) $testdir/file7 \
		$((off + (blksz * 4))) $testdir/file8 \
		168 $testdir/file1 \
		$((blksz - 168)) $testdir/file2 \
		$((filesz - 777)) $testdir/file3 \
		$(((blksz * 3) - 168)) $testdir/file4 \


echo "Compare files before remount" | tee -a $seqres.full
compare
_test_cycle_mount

echo "Compare files after remount" | tee -a $seqres.full
compare

echo "Check for non-shared extents" | tee -a $seqres.full
$FILEFRAG_PROG -v $testdir/file1 $testdir/file2 $testdir/file3 $testdir/file4 \
		  $testdir/file5 $testdir/file6 $testdir/file7 $testdir/file8 \
		  | grep '^[[:space:]]*[0-9]*:' > $testdir/fiemap
cat $testdir/fiemap >> $seqres.full
grep -q 'shared' $testdir/fiemap || \
		echo "Expected to find shared extents"

grep -q -v 'shared' $testdir/fiemap || \
		echo "Expected to find non-shared extents"

# success, all done
status=0
exit