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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2013 Oracle. All Rights Reserved.
#
# FS QA Test No. 021
#
# A regression test of running btrfs balance and defrag concurrently.
#
# The test aims to trigger snapshot-aware defrag path in endio by
# running balance, which is not expected and leads to a crash.
#
. ./common/preamble
_begin_fstest auto quick balance defrag
# Import common functions.
. ./common/filter
# real QA test starts here
run_test()
{
_run_btrfs_balance_start $SCRATCH_MNT >> $seqres.full &
sleep 0.5
# In new versions of btrfs-progs (6.0+), the defrag command outputs to
# stdout the path of the files it operates on. So ignore that.
find $SCRATCH_MNT -type f -print0 | xargs -0 \
$BTRFS_UTIL_PROG filesystem defrag -f > /dev/null
sync
wait
}
_supported_fs btrfs
_require_scratch
_scratch_mkfs > /dev/null 2>&1
_scratch_mount
# This is going to reproduce a race senario between balance and the writeback
# of snapshot-aware defragment.
# we first create a few files to get higher btree height.
for j in `seq 0 100`; do
touch $SCRATCH_MNT/padding-$j
done
# Get 50 files with fragments by using backwards writes.
for j in `seq 0 50`; do
for i in `seq 20 -1 1`; do
$XFS_IO_PROG -f -d -c "pwrite $(($i * 4096)) 4096" \
$SCRATCH_MNT/foo-$j >> $seqres.full | _filter_xfs_io
done
done
# Make sure that our metadata makes it self on disk.
sync
run_test
# success, all done
echo "Silence is golden"
status=0
exit
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