tests/generic/172

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015, Oracle and/or its affiliates.  All Rights Reserved.
#
# FS QA Test No. 172
#
# Reflink a file that uses more than half of the space, then try to observe
# ENOSPC while copy-on-writing the file via the page cache.
#
. ./common/preamble
_begin_fstest auto quick clone

# Override the default cleanup function.
_cleanup()
{
    cd /
    rm -rf $tmp.* $testdir1
}

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

_require_scratch_reflink
_require_cp_reflink

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

testdir=$SCRATCH_MNT/test-$seq
mkdir $testdir

echo "Reformat with appropriate size"
blksz="$(_get_block_size $testdir)"
_scratch_unmount

file_size=$((768 * 1024 * 1024))
fs_size=$((1024 * 1024 * 1024))
_scratch_mkfs_sized $fs_size >> $seqres.full 2>&1
_scratch_mount >> $seqres.full 2>&1
rm -rf $testdir
mkdir $testdir

echo "Create a big file and reflink it"
_pwrite_byte 0x61 0 $file_size $testdir/bigfile >> $seqres.full 2>&1
_cp_reflink $testdir/bigfile $testdir/clonefile
_scratch_sync

echo "Allocate the rest of the space"
_fill_fs $fs_size  $testdir/space $blksz 0 >> $seqres.full 2>&1
_scratch_sync

echo "CoW the big file"
out="$(_pwrite_byte 0x62 0 $file_size $testdir/bigfile 2>&1 | \
	_filter_xfs_io_error)"
echo ${out} | grep -q "No space left on device" || echo "CoW should have failed with ENOSPC"
echo ${out} >> $seqres.full 2>&1
echo ${out}

echo "Remount and try CoW again"
_scratch_cycle_mount

out="$(_pwrite_byte 0x62 0 $file_size $testdir/bigfile 2>&1 | \
	_filter_xfs_io_error)"
echo ${out} | grep -q "No space left on device" || echo "CoW should have failed with ENOSPC"
echo ${out} >> $seqres.full 2>&1
echo ${out}

# success, all done
status=0
exit