Device-Mapper, Vold, and Encryption Mechanisms in Android System Partitions

The article explains Android’s device‑mapper framework—including dm‑linear, dm‑verity, and default‑key metadata encryption—how vold orchestrates partition mounting and key initialization, and how to inspect dm devices with dmctl commands while managing encryption keys stored in /data/misc/vold/user_keys.

Android system partitionsVolddefault-key

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Device-Mapper, Vold, and Encryption Mechanisms in Android System Partitions

IT Architects Alliance

Sep 21, 2021 · Fundamentals

Analyzing Android 6.0 Storage Architecture and Communication Design

This article examines Android 6.0’s storage architecture, detailing the roles and interactions of MountService, Vold, and the kernel, illustrating module and process structures, communication flows via sockets, and highlighting performance considerations such as thread blocking and ANR issues.

AndroidMountServiceProcess Communication

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Analyzing Android 6.0 Storage Architecture and Communication Design