[Feature Request] Option to define max useable Volumen to be used by Seafile

[SourceDoctor]

in seafile.conf i can limit Space per User with thia:

[quota]
# default user quota in GB, integer only
default = 100

an Option to limit complete used Seafile Space also would be usefull.

maybe:

[general]
# maximum used volumen in GB, integer only
max_space = 1000

Why is this usefull:
Example:
i have 1TB Space for Seafile, to be save i will let use 900GB.
Now i have limited Space per User up to 100GB.
But now i have 20 User, so 2TB Disk Usage would be possible, which i do not have.
With a system wide Space Limitation it could be prevented to "overfill" Seafile Data Space