Struct LayeredDisk

pub struct LayeredDisk { /* private fields */ }

A disk composed of multiple layers.

Implementations

impl LayeredDisk

pub async fn new( read_only: bool, layers: Vec<LayerConfiguration>, ) -> Result<Self, InvalidLayeredDisk>

Creates a new layered disk from a list of layers.

The layers must be ordered from top to bottom, with the top layer being the first in the list.

Trait Implementations

impl DiskIo for LayeredDisk

fn disk_type(&self) -> &str

Returns the disk type name as a string.

fn sector_count(&self) -> u64

Returns the current sector count.

fn sector_size(&self) -> u32

Returns the logical sector size of the backing store.

fn disk_id(&self) -> Option<[u8; 16]>

Optionally returns a 16-byte identifier for the disk, if there is a natural one for this backing store.

fn physical_sector_size(&self) -> u32

Returns the physical sector size of the backing store.

fn is_fua_respected(&self) -> bool

Returns true if the fua parameter to DiskIo::write_vectored is respected by the backing store by ensuring that the IO is immediately committed to disk.

fn is_read_only(&self) -> bool

Returns true if the disk is read only.

async fn read_vectored( &self, buffers: &RequestBuffers<'_>, sector: u64, ) -> Result<(), DiskError>

Issues an asynchronous read-scatter operation to the disk.

async fn write_vectored( &self, buffers: &RequestBuffers<'_>, sector: u64, fua: bool, ) -> Result<(), DiskError>

Issues an asynchronous write-gather operation to the disk.

async fn sync_cache(&self) -> Result<(), DiskError>

Issues an asynchronous flush operation to the disk.

fn wait_resize(&self, sector_count: u64) -> impl Future<Output = u64> + Send

Waits for the disk sector size to be different than the specified value.

async fn unmap( &self, sector_offset: u64, sector_count: u64, block_level_only: bool, ) -> Result<(), DiskError>

Unmap sectors from the layer.

fn unmap_behavior(&self) -> UnmapBehavior

Returns the behavior of the unmap operation.

fn optimal_unmap_sectors(&self) -> u32

Returns the optimal granularity for unmaps, in sectors.

fn pr(&self) -> Option<&dyn PersistentReservation>

Optionally returns a trait object to issue persistent reservation requests.

fn eject(&self) -> impl Future<Output = Result<(), DiskError>> + Send

Issues an asynchronous eject media operation to the disk.

impl Inspect for LayeredDisk

fn inspect(&self, req: Request<'_>)

Inspects the object.