Tag
on-disk-format
- Mar 7, 2026 Inode Tables and the Arithmetic of Inode Numbers How a fixed-size inode record is found from its number with one division, why the table is preallocated rather than grown, and what happens when the number of inodes runs out before the space does. filesystems
- Jan 16, 2025 The Superblock: Magic Number, Geometry, and Feature Flags How a filesystem announces its own layout at a fixed disk offset, why its feature bits are split into three classes with different contracts, and what a driver does when it meets a bit it does not understand. filesystems
- Nov 25, 2024 Extent Trees and the Replacement of Indirect Block Maps What an extent record actually encodes, why the inode-sized root makes small files free of external metadata, and how the tree splits when a file fragments. filesystems