Deepin Linux
Feb 7, 2025 · Fundamentals
Understanding ext4 Extent: Data Structures and B+‑Tree Mechanism
This article explains the purpose, design, and internal data structures of ext4 extents, describes how the B+‑tree indexes extents for efficient mapping of logical to physical blocks, and compares ext4’s extent mechanism with older file‑system addressing methods and other modern file systems.
B+TreeData StructuresEXT4
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