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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test No. 042
#
# Test stale data exposure via writeback using various file allocation
# modification commands. The presumption is that such commands result in partial
# writeback and can convert a delayed allocation extent, that might be larger
# than the ranged affected by fallocate, to a normal extent. If the fs happens
# to crash sometime between when the extent modification is logged and writeback
# occurs for dirty pages within the extent but outside of the fallocated range,
# stale data exposure can occur.
#
. ./common/preamble
_begin_fstest shutdown rw punch zero prealloc auto quick
# Import common functions.
. ./common/filter
. ./common/punch
# real QA test starts here
_crashtest()
{
cmd=$1
img=$SCRATCH_MNT/$seq.img
mnt=$SCRATCH_MNT/$seq.mnt
file=$mnt/file
size=$(_small_fs_size_mb 25)M
# Create an fs on a small, initialized image. The pattern is written to
# the image to detect stale data exposure.
$XFS_IO_PROG -f -c "truncate 0" -c "pwrite -S 0xCD 0 $size" $img \
>> $seqres.full 2>&1
_mkfs_dev $img >> $seqres.full 2>&1
mkdir -p $mnt
_mount -o loop -t $FSTYP $img $mnt
echo $cmd
# write, run the test command and shutdown the fs
$XFS_IO_PROG -f -c "pwrite -S 1 0 64k" -c "$cmd 60k 4k" $file | \
_filter_xfs_io
$here/src/godown -f $mnt
$UMOUNT_PROG $mnt
_mount -o loop -t $FSTYP $img $mnt
# We should /never/ see 0xCD in the file, because we wrote that pattern
# to the filesystem image to expose stale data.
if od -An -tx1 $file | grep -q "CD"; then
echo "Saw stale data!!!"
_hexdump $file
fi
$UMOUNT_PROG $mnt
}
# Modify as appropriate.
_supported_fs generic
_require_scratch
_require_scratch_shutdown
_require_xfs_io_command "falloc"
_require_xfs_io_command "fpunch"
_require_xfs_io_command "fzero"
_scratch_mkfs >/dev/null 2>&1
_require_local_device $SCRATCH_DEV
_require_metadata_journaling $SCRATCH_DEV
_scratch_mount
_crashtest "falloc -k"
_crashtest "fpunch"
_crashtest "fzero -k"
status=0
exit
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