Struct JournalTxBegin 

pub struct JournalTxBegin {
    pub tx_id: u64,
    pub lbas: [Option<LogicalBlockAddress>; 511],
}

Represents a journal transaction header used to track modified blocks.

This structure is used during transaction commit to list all blocks that are affected by the transaction.

Fields

tx_id: u64

Transaction id.

lbas: [Option<LogicalBlockAddress>; 511]

Array of logical block addresses involved in the transaction.

• Some(lba): a block to be committed.
• None: an unused slot.

Implementations

impl JournalTxBegin

pub fn new(tx_id: u64) -> Box<Self>

Creates a new, empty journal TxBegin block.

pub fn from_io( io: &JournalIO<'_>, lba: LogicalBlockAddress, ) -> Result<Box<Self>, KernelError>

Loads a journal TxBegin block from disk at the specified LBA.

Arguments

• io: Interface for reading blocks from disk.
• lba: Logical block address of the journal transaction block to load.

Returns

• Ok(Box<Self>): The loaded journal transaction block.
• Err(KernelError): If the block could not be read or parsed.

pub fn into_block(self: Box<Self>) -> Box<[u8; 4096]>

Converts this transaction into a 4096-byte block suitable for writing to disk.

This is typically used during transaction commit.