Struct LogBlockHeader 

pub struct LogBlockHeader {
    pub block_no: u32,
    pub flush_flag: bool,
    pub data_len: u16,
    pub first_rec_group: u16,
    pub checkpoint_no: u32,
}

Log block header (first 14 bytes of each 512-byte block).

Fields

block_no: u32

Block number (with flush bit masked out).

flush_flag: bool

Whether this block was the first in a flush batch (bit 31).

data_len: u16

Number of bytes of log data in this block (including header).

first_rec_group: u16

Offset of the first log record group starting in this block.

checkpoint_no: u32

Checkpoint number when this block was written.

Implementations

impl LogBlockHeader

pub fn parse(block: &[u8]) -> Option<Self>

Parse a log block header from a 512-byte block.

pub fn has_data(&self) -> bool

Returns true if this block contains log data (data_len > header size).

Trait Implementations

impl Clone for LogBlockHeader

fn clone(&self) -> LogBlockHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LogBlockHeader

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

Formats the value using the given formatter.

impl Serialize for LogBlockHeader

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.