l am a student in college,in order for secondary development, l recently begin to analyse 
the source code of kosmosfs .There are few  docs about source code or its design   on the
offical website or wiki,so l just want to know are there any docs about kosmosfs except the paper 
about gfs. like UML diagram or anything else. lf there are,how can l get it or could anyone send 
to me ,thanks a lot