Module chunk 

Chunk: logical-to-physical address mapping for btrfs filesystems

Btrfs maps logical addresses to physical device offsets through chunk items stored in the chunk tree. The superblock embeds a small subset of the chunk tree (the system chunk array) to bootstrap access to the full chunk tree.

This module provides a ChunkTreeCache that resolves logical addresses to physical offsets, seeded from the sys_chunk_array and then populated from the full chunk tree.

Structs

ChunkMapping

A chunk mapping: maps a range of logical addresses to physical device locations.

ChunkTreeCache

Cache of chunk tree mappings for resolving logical to physical addresses.

Stripe

A single stripe in a chunk mapping.

Functions

parse_chunk_item

Parse a chunk item (btrfs_chunk + stripes) from a raw byte buffer.

seed_from_sys_chunk_array

Seed a ChunkTreeCache from the superblock’s sys_chunk_array.