tests/generic/171

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015, Oracle and/or its affiliates.  All Rights Reserved.
#
# FS QA Test No. 171
#
# Reflink a file, use up the rest 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

# real QA test starts here
_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)"
nr_blks=10240
umount $SCRATCH_MNT
sz_bytes=$((nr_blks * 8 * blksz))
if [ $sz_bytes -lt $((32 * 1048576)) ]; then
	sz_bytes=$((32 * 1048576))
fi
_scratch_mkfs_sized $sz_bytes >> $seqres.full 2>&1 || _fail "mkfs failed"
_scratch_mount >> $seqres.full 2>&1
rm -rf $testdir
mkdir $testdir

echo "Create a big file and reflink it"
_pwrite_byte 0x61 0 $((blksz * nr_blks)) $testdir/bigfile >> $seqres.full 2>&1
_cp_reflink $testdir/bigfile $testdir/clonefile
sync

echo "Allocate the rest of the space"
nr_free=$(stat -f -c '%f' $testdir)
_fill_fs $((nr_free * blksz)) $testdir/space $blksz 0 >> $seqres.full 2>&1
sync

echo "CoW the big file"
out="$(_pwrite_byte 0x62 0 $((blksz * nr_blks)) $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 $((blksz * nr_blks)) $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