Tag
extents
- Mar 19, 2026 Delayed Allocation and the Reservation Window Why holding back the block-allocation decision until writeback makes layout better and failure later, and how a per-file reservation prevents the space from being promised twice. 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
- May 19, 2022 Sparse Files and the Gap Between Length and Allocation A file can report a length of terabytes while occupying a few blocks, and the interface keeps the two numbers separate; seeks into the gap, hole punching, and the copy that silently fills it. filesystems