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Guide to Linux Device Mapper
Device Mapper is the invisible engine behind LVM, LUKS, dm-verity, and thin provisioning — yet most engineers never look under the hood. This illustrated guide gives you the complete picture: from BIO remapping and mapping tables to real-world stacking patterns like LVM-on-LUKS and Android Verified Boot. 8 chapters, all visual, zero fluff.
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About the Book
The Linux Device Mapper is one of the most powerful and least understood subsystems in the Linux kernel. It silently powers LVM, LUKS encryption, dm-verity (Android Verified Boot), thin provisioning, SSD caching, and more — yet most engineers treat it as a black box.
This visual guide changes that.
Through 8 illustrated chapters, you'll build a complete mental model of how Device Mapper intercepts block I/O, remaps it through configurable targets, and enables the storage abstractions that modern Linux systems depend on.
What you'll learn:
• How the Linux I/O stack works from user space down to physical hardware
• The Device Mapper architecture: mapping tables, BIO remapping, and kernel structures
• dm-linear and dm-stripe — the building blocks behind LVM and software RAID
• dm-crypt and LUKS — transparent block-level encryption with AES-XTS and Argon2id
• dm-verity and Merkle hash trees — how Android and Chrome OS verify system integrity
• Thin provisioning — on-demand allocation, overprovisioning, and copy-on-write snapshots
• Advanced targets: dm-cache (SSD tiering), dm-integrity (per-sector tags), dm-vdo (dedup + compression)
• Real-world stacking patterns: LVM on LUKS, Android Verified Boot, and composing DM layers
Every concept is explained with color-coded diagrams, architecture visuals, and code-level detail — no walls of text.
Prerequisites: Basic familiarity with block devices, Linux kernel modules, filesystems, and cryptography fundamentals.
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About the Author
Sumanth Murali
Engineer with deep expertise in Linux kernel internals, embedded systems security, and storage architecture. Writes illustrated technical guides that turn complex subsystems into visual, approachable knowledge.
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