tests/generic/655

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# FS QA Test No. 655
#
# See what happens if we MMAP CoW blocks 2-4 of a page's worth of blocks when
# the surrounding blocks vary between unwritten/regular/delalloc/hole.
# (MMAP version of generic/229,238)
#
# This test is dependent on the system page size, so we cannot use md5 in
# the golden output; we can only compare to a check file.
#
. ./common/preamble
_begin_fstest auto quick clone fiemap prealloc

# Import common functions.
. ./common/filter
. ./common/reflink

_require_scratch_reflink
_require_xfs_io_command "falloc"

pagesz=$(getconf PAGE_SIZE)
blksz=$((pagesz / 4))

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

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

real_blksz=$(_get_file_block_size $testdir)
test $real_blksz != $blksz && _notrun "Failed to format with small blocksize."

runtest() {
	echo "runtest $1 $2"
	b2=$1
	b4=$2
	dir=$3

	echo "Create the original files"
	mkdir -p $dir
	_pwrite_byte 0x61 0 $pagesz $dir/file1 >> $seqres.full

	$XFS_IO_PROG -f -c "truncate $pagesz" $dir/file2 >> $seqres.full
	$XFS_IO_PROG -f -c "truncate $pagesz" $dir/file2.chk >> $seqres.full

	case $b2 in
	"regular")
		_pwrite_byte 0x61 $blksz $blksz $dir/file2 >> $seqres.full
		_pwrite_byte 0x61 $blksz $blksz $dir/file2.chk >> $seqres.full
		;;
	"unwritten")
		$XFS_IO_PROG -f -c "falloc -k $blksz $blksz" $dir/file2 >> $seqres.full
		_pwrite_byte 0x00 $blksz $blksz $dir/file2.chk >> $seqres.full
		;;
	"hole")
		;;
	esac

	case $b4 in
	"regular")
		_pwrite_byte 0x61 $((blksz * 3)) $blksz $dir/file2 >> $seqres.full
		_pwrite_byte 0x61 $((blksz * 3)) $blksz $dir/file2.chk >> $seqres.full
		;;
	"unwritten")
		$XFS_IO_PROG -f -c "falloc -k $((blksz * 3)) $blksz" $dir/file2 >> $seqres.full
		_pwrite_byte 0x00 $((blksz * 3)) $blksz $dir/file2.chk >> $seqres.full
		;;
	"hole")
		;;
	esac

	_reflink_range $dir/file1 $blksz $dir/file2 $((blksz * 2)) $blksz >> $seqres.full
	_pwrite_byte 0x61 $((blksz * 2)) $blksz $dir/file2.chk >> $seqres.full
	_scratch_cycle_mount

	echo "Compare files"
	cmp -s $dir/file1 $dir/file2 && echo "file1 and file2 should not match."
	cmp -s $dir/file2 $dir/file2.chk || echo "file2 and file2.chk don't match."

	echo "CoW and unmount"
	if [ $b2 = "delalloc" ]; then
		_pwrite_byte 0x61 $blksz $blksz $dir/file2 >> $seqres.full
		_pwrite_byte 0x61 $blksz $blksz $dir/file2.chk >> $seqres.full

		# make sure we actually got delalloc block
		$FILEFRAG_PROG -v $dir/file2 2>&1 | grep -q delalloc || \
			_notrun "test requires delayed allocation writes"
	fi

	if [ $b4 = "delalloc" ]; then
		_pwrite_byte 0x61 $((blksz * 3)) $blksz $dir/file2 >> $seqres.full
		_pwrite_byte 0x61 $((blksz * 3)) $blksz $dir/file2.chk >> $seqres.full

		# make sure we actually got delalloc block
		$FILEFRAG_PROG -v $dir/file2 2>&1 | grep -q delalloc || \
			_notrun "test requires delayed allocation writes"
	fi

	$XFS_IO_PROG -f -c "mmap 0 $pagesz" \
        -c "pwrite -S 0x63 $((blksz + 17)) $((blksz * 3 - 34))" $dir/file2 >> $seqres.full
	$XFS_IO_PROG -f -c "mmap 0 $pagesz" \
        -c "pwrite -S 0x63 $((blksz + 17)) $((blksz * 3 - 34))" $dir/file2.chk >> $seqres.full
	_scratch_cycle_mount

	echo "Compare files"
	cmp -s $dir/file1 $dir/file2 && echo "file1 and file2 should not match."
	cmp -s $dir/file2 $dir/file2.chk || echo "file2 and file2.chk don't match."
}

runtest regular delalloc "$testdir/r-d"
runtest regular unwritten "$testdir/r-u"
runtest regular hole "$testdir/r-h"

runtest hole delalloc "$testdir/h-d"
runtest hole unwritten "$testdir/h-u"
runtest hole regular "$testdir/h-r"

runtest unwritten delalloc "$testdir/u-d"
runtest unwritten hole "$testdir/u-h"
runtest unwritten regular "$testdir/u-r"

runtest delalloc unwritten "$testdir/d-u"
runtest delalloc hole "$testdir/d-h"
runtest delalloc regular "$testdir/d-r"

# success, all done
status=0
exit