Basic balance scripts

balance.sh

#!/bin/bash

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

_fail()
{
	echo "!!! FAILED: $@ !!!"
	exit 1
}

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/subv

cp -r /lib $mnt/subv
cp -r /usr $mnt/subv

#for i in $(seq -w 1 8); do
#	fallocate -l 4k $mnt/subv/regular_$i
#	xfs_io -f -c "pwrite 0 2K" $mnt/subv/inline1_$i > /dev/null
#	xfs_io -f -c "pwrite 0 2K" $mnt/subv/inline2_$i > /dev/null
#	xfs_io -f -c "pwrite 0 2K" $mnt/subv/inline3_$i > /dev/null
#	xfs_io -f -c "pwrite 0 2K" $mnt/subv/inline4_$i > /dev/null
#	xfs_io -f -c "pwrite 0 2K" $mnt/subv/inline5_$i > /dev/null
#	xfs_io -f -c "pwrite 0 2K" $mnt/subv/inline6_$i > /dev/null
#	xfs_io -f -c "pwrite 0 2K" $mnt/subv/inline7_$i > /dev/null
#	xfs_io -f -c "pwrite 0 2K" $mnt/subv/inline8_$i > /dev/null
#done

random_touch()
{
	basedir=$1
	
	random_file="$(ls $basedir | sort -R | tail -1)"
	touch "$basedir/$random_file"
}

for i in $(seq -w  1 16); do
	btrfs subvolume snapshot $mnt/subv $mnt/snapshot_$i
	random_touch "$mnt/snapshot_$i/usr/lib"
	random_touch "$mnt/snapshot_$i/usr/include"
	random_touch "$mnt/snapshot_$i/usr/bin"
done
sync

#btrfs quota enable $mnt
#btrfs quota rescan -w $mnt

time btrfs balance start -m $mnt
umount $mnt
btrfs check $dev