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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Oracle, Inc. All Rights Reserved.
#
# FS QA Test No. 166
#
# Test for races or FS corruption when DIO writing to a file that's also
# the source of a reflink operation.
#
. ./common/preamble
_begin_fstest auto clone
_register_cleanup "_cleanup" BUS
# Override the default cleanup function.
_cleanup()
{
cd /
rm -rf $tmp.* $finished_file
wait
}
# Import common functions.
. ./common/filter
. ./common/reflink
# real QA test starts here
_require_scratch_reflink
_require_cp_reflink
_require_odirect
echo "Format and mount"
_scratch_mkfs > $seqres.full 2>&1
_scratch_mount >> $seqres.full 2>&1
testdir=$SCRATCH_MNT/test-$seq
finished_file=/tmp/finished
do_snapshot=/tmp/snapshot
rm -rf $finished_file
mkdir $testdir
loops=1024
nr_loops=$((loops - 1))
blksz=65536
echo "Initialize file"
echo >> $seqres.full
_pwrite_byte 0x61 0 $((loops * blksz)) $testdir/file1 >> $seqres.full
_scratch_cycle_mount
# Snapshot creator...
#
# We rate limit the snapshot creator to one snapshot per full file write. this
# limits the runtime on slow devices, whilst not substantially reducing the the
# number of snapshots taken on fast devices.
snappy() {
n=0
while [ ! -e $finished_file ]; do
if [ ! -e $do_snapshot ]; then
sleep 0.01
continue;
fi
out="$(_cp_reflink $testdir/file1 $testdir/snap_$n 2>&1)"
res=$?
echo "$out" | grep -q "No space left" && break
test -n "$out" && echo "$out"
test $res -ne 0 && break
n=$((n + 1))
rm -f $do_snapshot
done
}
echo "Snapshot a file undergoing directio rewrite"
snappy &
seq $nr_loops -1 0 | while read i; do
_pwrite_byte 0x63 $((i * blksz)) $blksz -d $testdir/file1 >> $seqres.full
touch $do_snapshot
done
touch $finished_file
wait
# success, all done
status=0
exit
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