How are reads and writes kept in order in raid5.c?

[Nathan Lewis <nathapl@cs.okstate.edu>]

I've gotten through most of handle_stripe, but I'm still confused on one 
big thing:  The reads and the writes are separated into two separate lists 
as soon as they come into make_request.  What guarantees they are done in 
order?  I can't see any mechanism that maintains any specific ordering of 
the bion.  Just that reads are done first, when possible, then 
writes.  What am I missing?

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