Quota system for glance
Currently, glance only has quota enforcement. The commit that introduced that feature clearly states that it doesn't care about actually setting quotas, only enforcement (which is fair). However, a pretty common use case is to limit images a user can create (esp if there is snapshot creator permission). Currently,there is no equivalent of the nova quota-* commands, only a byte setting in glance.conf. That implementation might ideally be different to how nova does it(acc to some), but it's probably not a bad idea to have a similar framework for glance.
Cinder (and nova) client seems to implement the following:
quota-class-show
quota-class-update
quota-defaults
quota-show
quota-update
quota-usage
This also seems to establish a trend of several services needing quota-* commands.