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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. 283
#
# Test mmap CoW behavior when the write temporarily fails but the userspace
# program writes again.
#
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.* $TEST_DIR/mwrite.out
_dmerror_cleanup
}
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
. ./common/reflink
. ./common/dmerror
# real QA test starts here
_supported_os Linux
_require_scratch_reflink
_require_cp_reflink
_require_dm_target error
rm -f $seqres.full
echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
_dmerror_init
_dmerror_mount >> $seqres.full 2>&1
testdir=$SCRATCH_MNT/test-$seq
mkdir $testdir
blksz=65536
nr=640
bufnr=128
filesize=$((blksz * nr))
bufsize=$((blksz * bufnr))
_require_fs_space $SCRATCH_MNT $((filesize / 1024 * 3 * 5 / 4))
echo "Create the original files"
$XFS_IO_PROG -f -c "pwrite -S 0x61 -b $bufsize 0 $filesize" $testdir/file1 >> $seqres.full
_cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
_dmerror_unmount
_dmerror_mount
echo "Compare files"
md5sum $testdir/file1 | _filter_scratch
md5sum $testdir/file2 | _filter_scratch
echo "CoW and unmount"
sync
_dmerror_load_error_table
# Insulate ourselves against bash reporting the SIGBUS when we try to modify
# the metadata.
cat > $tmp.run << ENDL
ulimit -c 0
$XFS_IO_PROG -f -c "mmap -rw 0 $filesize" -c "mwrite -S 0x63 0 $filesize" \
-c "msync -s 0 $filesize" $testdir/file2 2>&1
ENDL
bash $tmp.run > $tmp.output 2>&1
cat $tmp.output >> $seqres.full
grep -q error $tmp.output || _fail "mwrite did not fail"
_dmerror_load_working_table
echo "Rewrite"
$XFS_IO_PROG -f -c "mmap -rw 0 $filesize" -c "mwrite -S 0x63 0 $filesize" -c "msync 0 $filesize" $testdir/file2 >> $seqres.full 2>&1
_dmerror_unmount
_dmerror_mount
echo "Compare files"
md5sum $testdir/file1 | _filter_scratch
echo "Check for damage"
_dmerror_unmount
_dmerror_cleanup
_repair_scratch_fs >> $seqres.full
# success, all done
status=0
exit
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