COPE-04 Data Structures.indd 23 5 D at a S tr u ct u re s © 2 0 2 1 U w e R . Z im m er , T h e A u st ra li an N at io n al U n iv er si ty p ag e 2 3 […]
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single.dvi 40 File System Implementation In this chapter, we introduce a simple file system implementation, known as vsfs (the Very Simple File System). This file system is a simplified version of a typical UNIX file system and thus serves to introduce some of the basic on-disk structures, access methods, and various policies that you will
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single.dvi 42 Crash Consistency: FSCK and Journaling As we’ve seen thus far, the file system manages a set of data structures to implement the expected abstractions: files, directories, and all of the other metadata needed to support the basic abstraction that we expect from a file system. Unlike most data structures (for example, those found
single.dvi 17 Free-Space Management In this chapter, we take a small detour from our discussion of virtual- izing memory to discuss a fundamental aspect of any memory manage- ment system, whether it be a malloc library (managing pages of a pro- cess’s heap) or the OS itself (managing portions of the address space of a
single.dvi 26 Concurrency: An Introduction Thus far, we have seen the development of the basic abstractions that the OS performs. We have seen how to take a single physical CPU and turn it into multiple virtual CPUs, thus enabling the illusion of multiple pro- grams running at the same time. We have also seen how
single.dvi 24 Summary Dialogue on Memory Virtualization Student: (Gulps) Wow, that was a lot of material. Professor: Yes, and? Student: Well, how am I supposed to remember it all? You know, for the exam? Professor: Goodness, I hope that’s not why you are trying to remember it. Student: Why should I then? Professor: Come on,
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single.dvi 18 Paging: Introduction It is sometimes said that the operating system takes one of two approaches when solving most any space-management problem. The first approach is to chop things up into variable-sized pieces, as we saw with segmenta- tion in virtual memory. Unfortunately, this solution has inherent difficul- ties. In particular, when dividing a
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single.dvi 55 Access Control Chapter by Peter Reiher (UCLA) 55.1 Introduction So we know what our security goals are, we have at least a general sense of the security policies we’d like to enforce, and we have some ev- idence about who is requesting various system services that might (or might not) violate our policies.
single.dvi 48 Distributed Systems Distributed systems have changed the face of the world. When your web browser connects to a web server somewhere else on the planet, it is par- ticipating in what seems to be a simple form of a client/server distributed system. When you contact a modern web service such as Google or