Struct Header 

#[non_exhaustive]
pub struct Header {
    pub csum: [u8; 4],
    pub fsid: [u8; 16],
    pub bytenr: u64,
    pub flags: u64,
    pub chunk_tree_uuid: [u8; 16],
    pub generation: u64,
    pub owner: u64,
    pub nritems: u32,
    pub level: u8,
}

A parsed btrfs_header — the fixed 101-byte prefix of every node/leaf.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

csum: [u8; 4]

csum — the first 4 bytes of the 32-byte checksum field (the crc32c digest for a crc32c filesystem), verbatim.

fsid: [u8; 16]

fsid (offset 0x20) — the filesystem UUID.

bytenr: u64

bytenr (offset 0x30) — this node’s own logical address.

flags: u64

flags (offset 0x38).

chunk_tree_uuid: [u8; 16]

chunk_tree_uuid (offset 0x40).

generation: u64

generation (offset 0x50) — the transaction id that wrote this block (the CoW/staleness lever: an older generation marks a stale block).

owner: u64

owner (offset 0x58) — the objectid of the tree this block belongs to (1 = ROOT_TREE, 3 = CHUNK_TREE, …).

nritems: u32

nritems (offset 0x60) — the number of items (leaf) or key-pointers (interior) that follow the header.

level: u8

level (offset 0x64) — 0 = leaf, > 0 = interior node.

Trait Implementations

impl Clone for Header

fn clone(&self) -> Header

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Header

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Header

impl PartialEq for Header

fn eq(&self, other: &Header) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Header