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Parsing btrfs B-tree nodes and leaves from raw blocks

A btrfs filesystem is organized as a collection of B-trees. Each tree is stored as a hierarchy of blocks (nodesize bytes each, typically 16 KiB). Internal nodes contain key pointers to child blocks; leaves contain items with their associated data payloads.

This module provides typed Rust structs for all tree block components and enums for key types and well-known object IDs, with safe LE parsing from raw byte buffers.

Structs

DiskKey

A parsed btrfs disk key (objectid, type, offset).

Header

Parsed header of a btrfs tree block (shared by nodes and leaves).

HeaderFlags

Tree block header flags stored in btrfs_header::flags (lower 56 bits; the upper 8 bits hold the backref revision).

Item

A leaf item descriptor: key + offset/size into the leaf’s data area.

KeyPtr

A key pointer from an internal tree node, pointing to a child block.

Enums

KeyType

Btrfs item key type, identifying what kind of item a key refers to.

ObjectId

Well-known btrfs object IDs used as tree IDs, namespace roots, and special-purpose objectids in item keys.

TreeBlock

A parsed btrfs tree block: either an internal node or a leaf.

Functions

format_key

Format a key as (OBJECTID TYPE OFFSET) matching the C reference output.