apfstests/tests/overlay/016

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2016 CTERA Networks. All Rights Reserved.
#
# FSQA Test No. 016
#
# Test ro/rw fd data inconsistecies
#
# This simple test demonstrates a known issue with overlayfs:
# - process A opens file F for read
# - process B writes new data to file F
# - process A reads old data from file F
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -f $tmp.*
}

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

# real QA test starts here
_supported_fs overlay
_supported_os Linux
_require_scratch
_require_xfs_io_command "open"

rm -f $seqres.full

_scratch_mkfs >>$seqres.full 2>&1

# Create our test files.
lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
mkdir -p $lowerdir
echo "This is old news" > $lowerdir/foo

_scratch_mount


#
# open file for read (rofd)
# open file for write (rwfd)
# write to rwfd
# read from rofd
#
$XFS_IO_PROG -r $SCRATCH_MNT/foo \
	-C "open $SCRATCH_MNT/foo" \
	-C "pwrite -S 0x61 0 16" \
	-C "file 0" \
	-C "pread -v 0 16" \
| _filter_xfs_io | _filter_scratch

status=0
exit