6.9. Summary
Filing systems may be thought of as a service offered above an operating system kernel rather than a mandatory part of every kernel. Network-based filing systems are common and users' workstations may or may not have local filing systems. Traditional centralized operating systems, however, offer filing system services as part of a resident kernel and some system designs reflect an evolution from centralized to distributed systems.
A filing system is an example of a concurrent system. Many clients may simultaneously have requests outstanding. We shall consider how a filing system may have several client requests in progress simultaneously.
The data structures that a filing system is likely to use have also been discussed in some detail. ...
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