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The validation phase for a dirty file system is extremely important. Were a corrupted file system mounted, the corrupted data could potentially cause further damage to user data or even crash the system if it causes the file system to perform illegal operations. The importance of verifying that a file system is valid before mounting cannot be overstated. The task of verifying and possibly repairing a damaged file system is usually a very complex task. A journaled file system can replay its log to guarantee that the file system is consistent, but it should still verify other data structures before proceeding.

For example, if we added a Keyword attribute to a set of files and the Keyword attribute was indexed, the user could then issue queries asking which files contained various keywords regardless of their location in the hierarchy. When coupled with a good query language, indexing offers a powerful alternative interface to the file system. With queries, users are not restricted to navigating a fixed hierarchy of files; instead they can issue queries to find the working set of files they would like to see, regardless of the location of the files.

This allows for fine-grained control over the access to a file in comparison to the broad divisions defined in the POSIX security model. 6 Summary This chapter introduced and explained the basics of what a file system is, what it does, and what additional features a file system may choose to implement. At the simplest level a file system provides a way to store and retrieve data in a hierarchical organization. The two fundamental concepts of any file system are files and directories. In addition to the basics, a file system may choose to implement a variety of additional features that enable users to more easily manage, navigate, and Practical File System Design:The Be File System, Dominic Giampaolo page 32 32 2 W H AT I S A F I L E S Y S T E M ?

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