Struct btrfs_diskformat::Header

#[repr(C, packed)]
pub struct Header {
    pub csum: [u8; 32],
    pub fs_uuid: UuidBytes,
    pub logical_address: U64<LE>,
    pub flags: [u8; 7],
    pub backref_rev: u8,
    pub chunk_tree_uuid: UuidBytes,
    pub generation: U64<LE>,
    pub tree_id: U64<LE>,
    pub num_items: U32<LE>,
    pub level: u8,
}

The data stored at the start of every node.

Fields

csum: [u8; 32]

The checksum of everything after this field, including the internal/leaf node specific part.

fs_uuid: UuidBytes

The filesystem UUID.

logical_address: U64<LE>

The logical address of this node.

flags: [u8; 7]

The first 7 bits represent flags.

backref_rev: u8

The backref revision, which maps to a BackrefRevision value.

chunk_tree_uuid: UuidBytes

The chunk tree UUID.

generation: U64<LE>

The generation of this node.

tree_id: U64<LE>

The ID of the tree containing this node.

num_items: U32<LE>

The number of items held in this node.

level: u8

The level of this node. 0 indicates it is a leaf node.

Trait Implementations

impl AsBytes for Header

fn as_bytes(&self) -> &[u8]

Get the bytes of this value.

fn as_bytes_mut(&mut self) -> &mut [u8]where
    Self: FromBytes,

Get the bytes of this value mutably.

impl Clone for Header

fn clone(&self) -> Header

Returns a copy 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 FromBytes for Header

impl Unaligned for Header