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The Design and Implementation of the FreeBSD® Operating System, Second Edition by George V. Neville-Neil, Robert N.M. Watson, Marshall Kirk McKusick

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Chapter 9. The Fast Filesystem

9.1 Hierarchical Filesystem Management

The operations defined for local filesystems are divided into two parts. Common to all local filesystems are hierarchical naming, locking, quotas, attribute management, and protection. These features, which are independent of how data are stored, are provided by the UFS code described in the first seven sections of this chapter. The other part of the local filesystem, the filestore, is concerned with the organization and management of the data on the storage media. Storage is managed by the datastore filesystem operations that are provided by the FFS code described in the final two sections of this chapter. We use the acronym UFS when referring to the fast filesystem in this ...

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