file system

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single.dvi 43 Log-structured File Systems In the early 90’s, a group at Berkeley led by Professor John Ousterhout and graduate student Mendel Rosenblum developed a new file system known as the log-structured file system [RO91]. Their motivation to do so was based on the following observations: • System memories are growing: As memory gets bigger, […]

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single.dvi 2 Introduction to Operating Systems If you are taking an undergraduate operating systems course, you should already have some idea of what a computer program does when it runs. If not, this book (and the corresponding course) is going to be difficult — so you should probably stop reading this book, or run to

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single.dvi 29 Lock-based Concurrent Data Structures Before moving beyond locks, we’ll first describe how to use locks in some common data structures. Adding locks to a data structure to make it us- able by threads makes the structure thread safe. Of course, exactly how such locks are added determines both the correctness and performance of

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single.dvi 45 Data Integrity and Protection Beyond the basic advances found in the file systems we have studied thus far, a number of features are worth studying. In this chapter, we focus on reliability once again (having previously studied storage system reliabil- ity in the RAID chapter). Specifically, how should a file system or storage

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single.dvi B Virtual Machine Monitors B.1 Introduction Years ago, IBM sold expensive mainframes to large organizations, and a problem arose: what if the organization wanted to run different oper- ating systems on the machine at the same time? Some applications had been developed on one OS, and some on others, and thus the problem. As

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single.dvi 41 Locality and The Fast File System When the UNIX operating system was first introduced, the UNIX wizard himself Ken Thompson wrote the first file system. Let’s call that the “old UNIX file system”, and it was really simple. Basically, its data structures looked like this on the disk: S Inodes Data The super

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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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book Contents To Everyone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii To Educators . . . . . . . . . . . . . . . . . .

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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

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book Preface To Everyone Welcome to this book! We hope you’ll enjoy reading it as much as we enjoyed writing it. The book is called Operating Systems: Three Easy Pieces (available at http://www.ostep.org), and the title is obviously an homage to one of the greatest sets of lecture notes ever created, by one Richard Feynman

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