Struct VmoLayerObject 

pub struct VmoLayerObject { /* private fields */ }

A read-only LayerObject backed by a zx::Vmo mapped into the current process’s address space. Used by remote volume clients to read layer files synchronously via SyncPersistentLayer.

Implementations

impl VmoLayerObject

pub fn new( vmo: Vmo, object_id: u64, block_size: BlockSize, ) -> Result<Self, Error>

Trait Implementations

impl LayerObject for VmoLayerObject

fn as_slice(&self) -> Option<&[u8]>

Returns a memory-mapped slice of the entire layer file if supported (e.g. when backed by a pager-managed VMO).

fn has_io_error(&self) -> bool

Returns true if an underlying I/O error occurred while paging in data for this object.

fn purge_cached_data(&self)

Requests that cached data (such as paged-in pages) for this object be purged.

fn prefetch(&self, range: Range<u64>)

Prefetches the given byte range of the layer file into memory if supported.

fn close<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Called when the layer is closed to release any external resources (such as pager registrations).

fn get_vmo(&self) -> Option<&Vmo>

Returns the underlying VMO backing this layer file if supported.

impl ObjectHandle for VmoLayerObject

fn object_id(&self) -> u64

Returns the object identifier for this object which will be unique for the store that the object is contained in, but not necessarily unique within the entire system.

fn block_size(&self) -> BlockSize

Returns the filesystem block size, which should be at least as big as the device block size, but not necessarily the same.

fn allocate_buffer(&self, _size: usize) -> BufferFuture<'_>

Allocates a buffer for doing I/O (read and write) for the object.

fn set_trace(&self, _v: bool)

Sets tracing for this object.

impl ReadObjectHandle for VmoLayerObject

fn read_aligned<'life0, 'life1, 'async_trait>( &'life0 self, _offset: u64, _buf: MutableBufferRef<'life1>, ) -> Pin<Box<dyn Future<Output = Result<usize, Error>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Fills buf with bytes read from offset on the underlying device.

fn get_size(&self) -> u64

Returns the size of the object.