OPTFS

Please read the paper OPTFS and answer the following questions:

1. What problem does this paper want to solve? In one sentence.

2. What is Asynchronous Durability Notification? Why is it useful for implementing optimistic crash consistency?

3. Why does this paper propose two sync-related calls (osync and dsync)? Please give some examples where osync or dsync is suitable, respectively.

The deadline for your answer and questions is 23:59, 2019-10-22.