qgroup_lockup.sh

#!/bin/bash

dev=/dev/test/test
mnt=/mnt/btrfs

dmesg -C

umount $mnt &> /dev/null
umount $dev &> /dev/null

mkfs.btrfs -f $dev -n 4k -m single
mount $dev $mnt -o nospace_cache,max_inline=2048

#btrfs sub create $mnt/src
mkdir $mnt/src
mkdir -p $mnt/snapshots
btrfs quota enable $mnt
btrfs quota rescan -w $mnt

fill_workload()
{
	for i in $(seq 1 10000); do
		xfs_io -f -c "pwrite 0 512K" $mnt/src/file_large_$i > /dev/null
		xfs_io -f -c "pwrite 0 2K" $mnt/src/file_inline_$i > /dev/null

		if [ $(( $i % 5 )) -eq 0 ]; then
			rm $mnt/src/$(ls $mnt/src/ | sort -R | tail -n1)
		fi
	done
	echo "fill_workload finished"
}

snapshot_workload()
{
	for i in $(seq 1 10000); do
		sleep 2
		#btrfs subv snapshot $mnt/src $mnt/snapshots/$i
		btrfs subv snapshot $mnt $mnt/snapshots/$i
	done
	echo "snapshot_workoad finished"
}

delete_workload()
{
	while true; do
		sleep 4
		last=$(ls $mnt/snapshots | sort | tail -n1)
		dest=$(( $RANDOM % $last + 1))
		if [ -d $mnt/snapshots/$dest ]; then
			btrfs subv delete $mnt/snapshots/${dest}
		fi
	done
}

fill_workload &
sleep 3
snapshot_workload &
delete_workload &

sleep 60
kill 0