[Dovecot] Quota plugin API documentation ?

[Craig Huckabee]

   What is the best reference for the quota plugin API ?  I have some 
code that can return the disk quota from AFS that I would like to add to 
the existing file system quota plugin (or perhaps create a new plugin) 
but I am having a hard time deciphering what each function should return 
and the data formats (e.g. kilobytes versus bytes).

   Any pointers are appreciated.

--Craig