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The Linux Virtual Filesystem (VFS) is one of the most elegant abstractions in operating system design: a universal interface that allows dozens of disparate storage technologies to coexist under a single coherent API. This book takes you from foundational concepts through kernel internals to advanced topics like containerization, cloud-native storage, and modern async I/O. Whether you are a system administrator troubleshooting production filesystem issues, a developer building on FUSE or overlayfs, or a kernel engineer contributing to the VFS subsystem, this book provides the deep understanding needed to work with Linux filesystems at every level. The technical baseline assumes familiarity with the Linux 6.x kernel series.

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Kick off your book project, get started with GhostAI, get better at marketing, or spend the day doing all three! Free live workshops on Zoom. Saturday, June 27, 2026.

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