On 2019/1/11 下午1:01, Qu Wenruo wrote:
[snip]
> +# 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".

Although the test case is already merged, btrfs community is going to
use a much better fix than this.

Should I update the patch in this test case after the fix get merged
upstream?

Thanks,
Qu

> +#
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +	cd /
> +	rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs btrfs
> +_supported_os Linux
> +_require_scratch
> +
> +# default sleep interval
> +sleep_time=1
> +
> +# stress test runtime
> +runtime=120
> +
> +_scratch_mkfs > /dev/null 2>&1
> +_scratch_mount
> +
> +mkdir -p "$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)
> +		$BTRFS_UTIL_PROG subvolume delete \
> +			"$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
> +
> +# success, all done
> +echo "Silence is golden"
> +
> +status=0
> +exit
> diff --git a/tests/btrfs/179.out b/tests/btrfs/179.out
> new file mode 100644
> index 000000000000..cb9eba3d34b1
> --- /dev/null
> +++ b/tests/btrfs/179.out
> @@ -0,0 +1,2 @@
> +QA output created by 179
> +Silence is golden
> diff --git a/tests/btrfs/group b/tests/btrfs/group
> index 04c0254aa4bf..46dd3c9523c2 100644
> --- a/tests/btrfs/group
> +++ b/tests/btrfs/group
> @@ -181,3 +181,4 @@
>  176 auto quick swap volume
>  177 auto quick swap balance
>  178 auto quick send
> +179 auto qgroup dangerous
>