Struct Header

#[repr(C, packed(1))]
pub struct Header {
    pub csum: [u8; 32],
    pub fs_uuid: UuidBytes,
    pub logical_address: U64,
    pub flags: [u8; 7],
    pub backref_rev: BackrefRevision,
    pub chunk_tree_uuid: UuidBytes,
    pub generation: U64,
    pub tree_id: U64,
    pub num_items: U32,
    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

The logical address of this node.

flags: [u8; 7]

The first 7 bits represent flags.

backref_rev: BackrefRevision

The backref revision, which maps to a BackrefRevision value.

chunk_tree_uuid: UuidBytes

The chunk tree UUID.

generation: U64

The generation of this node.

tree_id: U64

The ID of the tree containing this node.

num_items: U32

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 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 KnownLayout for Header

where u8: KnownLayout,

type PointerMetadata = <u8 as KnownLayout>::PointerMetadata

The type of metadata stored in a pointer to Self.

impl TryFromBytes for Header

where [u8; 32]: TryFromBytes, UuidBytes: TryFromBytes, U64: TryFromBytes, [u8; 7]: TryFromBytes, BackrefRevision: TryFromBytes, U32: TryFromBytes, u8: TryFromBytes,

fn try_mut_from_bytes( bytes: &mut [u8], ) -> Result<&mut Self, ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout + IntoBytes,

Attempts to interpret the given source as a &mut Self without copying.

fn try_mut_from_prefix( source: &mut [u8], ) -> Result<(&mut Self, &mut [u8]), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout + IntoBytes,

Attempts to interpret the prefix of the given source as a &mut Self.

fn try_mut_from_suffix( source: &mut [u8], ) -> Result<(&mut [u8], &mut Self), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout + IntoBytes,

Attempts to interpret the suffix of the given source as a &mut Self.

fn try_mut_from_bytes_with_elems( source: &mut [u8], count: usize, ) -> Result<&mut Self, ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout<PointerMetadata = usize> + IntoBytes,

Attempts to interpret the given source as a &mut Self with a DST length equal to count.

fn try_mut_from_prefix_with_elems( source: &mut [u8], count: usize, ) -> Result<(&mut Self, &mut [u8]), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout<PointerMetadata = usize> + IntoBytes,

Attempts to interpret the prefix of the given source as a &mut Self with a DST length equal to count.

fn try_mut_from_suffix_with_elems( source: &mut [u8], count: usize, ) -> Result<(&mut [u8], &mut Self), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout<PointerMetadata = usize> + IntoBytes,

Attempts to interpret the suffix of the given source as a &mut Self with a DST length equal to count.

fn try_read_from_bytes( source: &[u8], ) -> Result<Self, ConvertError<Infallible, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: Sized,

Attempts to read the given source as a Self.

fn try_read_from_prefix( source: &[u8], ) -> Result<(Self, &[u8]), ConvertError<Infallible, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: Sized,

Attempts to read a Self from the prefix of the given source.

fn try_read_from_suffix( source: &[u8], ) -> Result<(&[u8], Self), ConvertError<Infallible, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: Sized,

Attempts to read a Self from the suffix of the given source.

impl IntoBytes for Header

where [u8; 32]: IntoBytes, UuidBytes: IntoBytes, U64: IntoBytes, [u8; 7]: IntoBytes, BackrefRevision: IntoBytes, U32: IntoBytes, u8: IntoBytes,

impl Unaligned for Header