btrfs quota to simulate total disk size
btrfs quota to simulate total disk size

Patch for https://github.com/lxc/lxd/issues/7062

Signed-off-by: Malte Kuhn <f95f8ec333dce31ff72bb77a55c701e0276c100f@maxcluster.de>

stgraber/lxd,stgraber/lxd,mjeanson/lxd,mjeanson/lxd,Skarlso/lxd,atxwebs/lxd,stgraber/lxd,lxc/lxd,lxc/lxd,hallyn/lxd,Skarlso/lxd,stgraber/lxd,stgraber/lxd,Skarlso/lxd,mjeanson/lxd,lxc/lxd,atxwebs/lxd,atxwebs/lxd,hallyn/lxd,stgraber/lxd,Skarlso/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,hallyn/lxd,atxwebs/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,hallyn/lxd,lxc/lxd