On Thursday February 19, nathapl@cs.okstate.edu wrote: > 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? You aren't missing anything in the code - no ordering is enforced. If a filesystem issues a 'write' request and then, before that completes, issues a read request, the read could get either the before or after values. But that is probably true of normal disk-drives too. A filesystem simply shouldn't do that. Does that clear up the question? NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
