Struct RefcountHeader 

#[repr(C)]
pub struct RefcountHeader {
    pub magic: u32,
    pub version: u16,
    pub refcount_width: u8,
    pub _pad: u8,
    pub cluster_count: u32,
    pub max_refcount: u32,
    pub array_offset: u64,
    pub snapshot_epoch: u32,
    pub _reserved: u32,
}

32-byte header for REFCOUNT_SEG payloads.

Follows the standard 64-byte SegmentHeader. All multi-byte fields are little-endian on the wire.

Fields

magic: u32

Magic: REFCOUNT_MAGIC (0x52565243, “RVRC”).

version: u16

RefcountHeader format version (currently 1).

refcount_width: u8

Width of each refcount entry in bytes (1, 2, or 4).

_pad: u8

Padding (must be zero).

cluster_count: u32

Number of clusters tracked.

max_refcount: u32

Maximum refcount value before overflow.

array_offset: u64

Offset to the refcount array within the segment payload.

snapshot_epoch: u32

Snapshot epoch: 0 = mutable, >0 = frozen at this epoch.

_reserved: u32

Reserved (must be zero).

Implementations

impl RefcountHeader

pub fn to_bytes(&self) -> [u8; 32]

Serialize the header to a 32-byte little-endian array.

pub fn from_bytes(data: &[u8; 32]) -> Result<Self, RvfError>

Deserialize a RefcountHeader from a 32-byte slice.

Trait Implementations

impl Clone for RefcountHeader

fn clone(&self) -> RefcountHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RefcountHeader

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

Formats the value using the given formatter.

impl Copy for RefcountHeader