#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015, Oracle and/or its affiliates.  All Rights Reserved.
#
# FS QA Test No. 128
#
# Ensure that xfs_fsr un-reflinks files while defragmenting
#
. ./common/preamble
_begin_fstest auto quick clone fsr prealloc

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

# real QA test starts here
_supported_fs xfs
_require_test_lsattr
_require_scratch_reflink
_require_cp_reflink
_require_xfs_io_command "falloc"

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

testdir=$SCRATCH_MNT/test-$seq
mkdir $testdir
free_blocks0=$(stat -f $testdir -c '%f')

echo "Create the original file and reflink to file2, file3"
blks=2000
margin=160
blksz=65536
real_blksz="$(_get_block_size $testdir)"
blksz_factor=$((blksz / real_blksz))

# The expected free space numbers in this test require file1 and file4 to share
# the same blocks at the end of the test.  Therefore, we need the allocator to
# give file1 a single extent at the start of the test so that fsr will not be
# tempted to "defragment" a multi-extent file1 or file4.  Defragmenting really
# means rewriting the file, and if that succeeds on either file, we'll have
# unshared the space and there will be too little free space.  Therefore,
# preallocate space to try to produce a single extent.
$XFS_IO_PROG -f -c "falloc 0 $((blks * blksz))" $testdir/file1 >> $seqres.full
_pwrite_byte 0x61 0 $((blks * blksz)) $testdir/file1 >> $seqres.full
sync

nextents=$($XFS_IO_PROG -c 'stat' $testdir/file1 | grep 'fsxattr.nextents' | awk '{print $3}')

_cp_reflink $testdir/file1 $testdir/file2
_cp_reflink $testdir/file2 $testdir/file3
_cp_reflink $testdir/file3 $testdir/file4
_scratch_cycle_mount
free_blocks1=$(stat -f $testdir -c '%f')

md5sum $testdir/file1 | _filter_scratch
md5sum $testdir/file2 | _filter_scratch
md5sum $testdir/file3 | _filter_scratch
md5sum $testdir/file4 | _filter_scratch

c01=$(_md5_checksum $testdir/file1)
c02=$(_md5_checksum $testdir/file2)
c03=$(_md5_checksum $testdir/file3)
c04=$(_md5_checksum $testdir/file4)

echo "CoW the reflink copies"
_pwrite_byte 0x62 $blksz $blksz $testdir/file2 >> $seqres.full
_pwrite_byte 0x63 $(( blksz * (blks - 1) )) $blksz $testdir/file3 >> $seqres.full
_scratch_cycle_mount
free_blocks2=$(stat -f $testdir -c '%f')

md5sum $testdir/file1 | _filter_scratch
md5sum $testdir/file2 | _filter_scratch
md5sum $testdir/file3 | _filter_scratch
md5sum $testdir/file4 | _filter_scratch

c11=$(_md5_checksum $testdir/file1)
c12=$(_md5_checksum $testdir/file2)
c13=$(_md5_checksum $testdir/file3)
c14=$(_md5_checksum $testdir/file4)

echo "Defragment"
lsattr -l $testdir/ | _filter_scratch | _filter_spaces | sed -e 's/DAX/---/g'
$XFS_FSR_PROG -v -d $testdir/file1 >> $seqres.full
$XFS_FSR_PROG -v -d $testdir/file2 >> $seqres.full # fsr probably breaks the link
$XFS_FSR_PROG -v -d $testdir/file3 >> $seqres.full # fsr probably breaks the link
$XFS_FSR_PROG -v -d $testdir/file4 >> $seqres.full # fsr probably ignores this file
_scratch_cycle_mount
free_blocks3=$(stat -f $testdir -c '%f')

md5sum $testdir/file1 | _filter_scratch
md5sum $testdir/file2 | _filter_scratch
md5sum $testdir/file3 | _filter_scratch
md5sum $testdir/file4 | _filter_scratch

c21=$(_md5_checksum $testdir/file1)
c22=$(_md5_checksum $testdir/file2)
c23=$(_md5_checksum $testdir/file3)
c24=$(_md5_checksum $testdir/file4)

echo "Check files"
test $c01 = $c02 || echo "Files 1-2 do not match"
test $c01 = $c03 || echo "Files 1-3 do not match"
test $c01 = $c04 || echo "Files 1-4 do not match"
test $c02 = $c03 || echo "Files 2-3 do not match"
test $c02 = $c04 || echo "Files 2-4 do not match"
test $c03 = $c04 || echo "Files 3-4 do not match"

test $c01 = $c11 || echo "File1 should not be different after CoW"
test $c02 != $c12 || echo "File2 should be different after CoW"
test $c03 != $c13 || echo "File3 should be different after CoW"
test $c04 = $c14 || echo "File4 should not be different after CoW"

test $c11 = $c21 || echo "File1 changed by defrag"
test $c12 = $c22 || echo "File2 changed by defrag"
test $c13 = $c23 || echo "File3 changed by defrag"
test $c14 = $c24 || echo "File4 changed by defrag"

#echo $free_blocks0 $free_blocks1 $free_blocks2 $free_blocks3

freesp_bad=0

_within_tolerance "free blocks after creating some reflink copies" \
	$free_blocks1 $((free_blocks0 - (blks * blksz_factor) )) $margin -v || freesp_bad=1

_within_tolerance "free blocks after CoW some reflink copies" \
	$free_blocks2 $((free_blocks1 - 2)) $margin -v || freesp_bad=1

_within_tolerance "free blocks after defragging all reflink copies" \
	$free_blocks3 $((free_blocks2 - (blks * 2 * blksz_factor))) $margin -v || freesp_bad=1

_within_tolerance "free blocks after all tests" \
	$free_blocks3 $((free_blocks0 - (blks * 3 * blksz_factor))) $margin -v || freesp_bad=1

if [ $freesp_bad -ne 0 ] && [ $nextents -gt 1 ]; then
	echo "free space checks probably failed because file1 nextents was $nextents"
fi

# success, all done
status=0
exit