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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 179
#
# Test if btrfs will lockup at subvolume deletion when qgroups are enabled.
#
# This bug is going to be fixed by a patch for the kernel titled
# "btrfs: qgroup: Don't trigger backref walk at delayed ref insert time".
#
. ./common/preamble
_begin_fstest auto qgroup dangerous
# Import common functions.
. ./common/filter
# real QA test starts here
# Modify as appropriate.
_supported_fs btrfs
_require_scratch
# default sleep interval
sleep_time=1
# stress test runtime
runtime=120
_scratch_mkfs > /dev/null 2>&1
_scratch_mount
mkdir -p "$SCRATCH_MNT/snapshots"
$BTRFS_UTIL_PROG subvolume create "$SCRATCH_MNT/src" > /dev/null
$BTRFS_UTIL_PROG quota enable "$SCRATCH_MNT" > /dev/null
$BTRFS_UTIL_PROG quota rescan -w "$SCRATCH_MNT" > /dev/null
fill_workload()
{
trap "wait; exit" SIGTERM
local i=0
while true; do
_pwrite_byte 0xcd 0 8K "$SCRATCH_MNT/src/large_$i" > /dev/null
_pwrite_byte 0xcd 0 2K "$SCRATCH_MNT/src/inline_$i" > /dev/null
# Randomly remove some files for every 5 loop
if [ $(( $i % 5 )) -eq 0 ]; then
victim=$(ls "$SCRATCH_MNT/src" | sort -R | head -n1)
rm "$SCRATCH_MNT/src/$victim"
fi
i=$((i + 1))
done
}
snapshot_workload()
{
trap "wait; exit" SIGTERM
local i=0
while true; do
sleep $sleep_time
$BTRFS_UTIL_PROG subvolume snapshot "$SCRATCH_MNT/src" \
"$SCRATCH_MNT/snapshots/$i" > /dev/null
i=$((i + 1))
done
}
delete_workload()
{
trap "wait; exit" SIGTERM
while true; do
sleep $((sleep_time * 2))
victim=$(ls "$SCRATCH_MNT/snapshots" | sort -R | head -n1)
if [ -z "$victim" ]; then
# No snapshots available, sleep and retry later.
continue
fi
$BTRFS_UTIL_PROG subvolume delete \
"$SCRATCH_MNT/snapshots/$victim" > /dev/null
done
}
fill_workload &
fill_pid=$!
sleep $((sleep_time * 2))
snapshot_workload &
snapshot_pid=$!
delete_workload &
delete_pid=$!
sleep $runtime
kill $fill_pid
wait $fill_pid
kill $snapshot_pid
wait $snapshot_pid
kill $delete_pid
wait $delete_pid
# By the async nature of qgroup tree scan and subvolume delete, the latest
# qgroup counts at the time of umount might not be upto date, if it isn't
# then the check will report the difference in count. The difference in
# qgroup counts are anyway updated in the following mount, so it is not a
# real issue that this test case is trying to verify. So make sure the
# qgroup counts are in sync before unmount happens.
$BTRFS_UTIL_PROG subvolume sync $SCRATCH_MNT >> $seqres.full
# success, all done
echo "Silence is golden"
status=0
exit
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