Struct Jbd2Dev 

pub struct Jbd2Dev<B: BlockDevice> { /* private fields */ }

Block device proxy that optionally routes metadata writes through JBD2.

Implementations

impl<B: BlockDevice> Jbd2Dev<B>

pub fn initial_jbd2dev(_mode: u8, block_dev: B, use_journal: bool) -> Self

Creates a new JBD2 block device proxy.

pub fn is_use_journal(&self) -> bool

Returns whether journal support is enabled.

pub fn journal_sequence(&self) -> Option<u32>

Returns the current journal transaction sequence if journal is active.

pub fn journal_replay(&mut self)

Replays the journal if the proxy is configured to use it.

pub fn set_journal_use(&mut self, use_journal: bool)

Enables or disables journal use at runtime.

pub fn set_journal_superblock( &mut self, super_block: JournalSuperBllockS, journal_start_block: AbsoluteBN, )

Installs the journal superblock so JBD2 state can be initialized lazily.

pub fn umount_commit(&mut self)

Commits all buffered journal transactions during unmount.

pub fn write_block( &mut self, block_id: AbsoluteBN, is_metadata: bool, ) -> Ext4Result<()>

Writes the current internal block buffer.

pub fn read_block(&mut self, block_id: AbsoluteBN) -> Ext4Result<()>

Reads one block through the cached inner device.

pub fn buffer(&self) -> &[u8]

Returns the cached block buffer.

pub fn buffer_mut(&mut self) -> &mut [u8]

Returns the cached block buffer mutably.

pub fn read_blocks( &mut self, buf: &mut [u8], block_id: AbsoluteBN, count: u32, ) -> Ext4Result<()>

Reads multiple blocks directly.

pub fn write_blocks( &mut self, buf: &[u8], block_id: AbsoluteBN, count: u32, is_metadata: bool, ) -> Ext4Result<()>

Writes multiple blocks, optionally journaling metadata buffers.

pub fn cantflush(&mut self) -> Ext4Result<()>

Flushes the inner cached device.

pub fn total_blocks(&self) -> u64

Returns the total number of device blocks.

pub fn block_size(&self) -> u32

Returns the underlying device block size.

pub fn current_time(&self) -> Ext4Result<Ext4Timestamp>

Returns the current timestamp from the underlying device.