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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved.
#
# FS QA Test No. 221
#
# Ensuring that copy on write in buffered mode works when the CoW
# range originally covers multiple extents, some holes, some not.
# - Set cowextsize hint.
# - Create a file and truncate a second file.
# - Reflink the odd blocks of the first file into the second file.
# - CoW across the halfway mark, starting with the unwritten extent.
# - Check that the files are now different where we say they're different.
#
. ./common/preamble
_begin_fstest auto quick clone prealloc
# Import common functions.
. ./common/filter
. ./common/reflink
# real QA test starts here
_require_scratch_reflink
_require_xfs_io_command "falloc"
_require_xfs_io_command "cowextsize"
echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
_scratch_mount >> $seqres.full 2>&1
testdir=$SCRATCH_MNT/test-$seq
mkdir $testdir
echo "Create the original files"
blksz=65536
_require_congruent_file_oplen $SCRATCH_MNT $blksz
nr=64
filesize=$((blksz * nr))
real_blksz=$(_get_block_size $testdir)
internal_blks=$((filesize / real_blksz))
$XFS_IO_PROG -c "cowextsize $((blksz * 16))" $testdir >> $seqres.full
_weave_reflink_holes $blksz $nr $testdir/file1 $testdir/file3 >> $seqres.full
_scratch_cycle_mount
echo "Compare files"
md5sum $testdir/file1 | _filter_scratch
md5sum $testdir/file3 | _filter_scratch
md5sum $testdir/file3.chk | _filter_scratch
echo "CoW across the transition"
cowoff=$((filesize / 4))
cowsz=$((filesize / 2))
$XFS_IO_PROG -f -c "pwrite -S 0x63 -b $cowsz $cowoff $cowsz" $testdir/file3 >> $seqres.full
_pwrite_byte 0x63 $cowoff $cowsz $testdir/file3.chk >> $seqres.full
_scratch_cycle_mount
echo "Compare files"
md5sum $testdir/file1 | _filter_scratch
md5sum $testdir/file3 | _filter_scratch
md5sum $testdir/file3.chk | _filter_scratch
echo "Check extent counts"
old_extents=$(_count_extents $testdir/file1)
new_extents=$(_count_extents $testdir/file3)
echo "old extents: $old_extents" >> $seqres.full
echo "new extents: $new_extents" >> $seqres.full
echo "maximum extents: $internal_blks" >> $seqres.full
test $((new_extents - (nr / 4))) -lt $((internal_blks / 2)) || echo "file3 badly fragmented"
# success, all done
status=0
exit
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