Struct ReadOnlyDevice 

pub struct ReadOnlyDevice<H: ReadObjectHandle> { /* private fields */ }

Allows using anything that implements ReadObjectHandle as a read-only storage Device.

Implementations

impl<H: ReadObjectHandle> ReadOnlyDevice<H>

pub fn new(handle: H) -> Result<Self, Error>

Trait Implementations

impl<H: ReadObjectHandle> Device for ReadOnlyDevice<H>

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

Allocates a transfer buffer of at least |size| bytes for doing I/O with the device. The actual size of the buffer will be rounded up to a block-aligned size. Blocks until enough capacity is available in the buffer.

fn block_size(&self) -> u32

Returns the block size of the device. Buffers are aligned to block-aligned chunks.

fn block_count(&self) -> u64

Returns the number of blocks of the device.

fn read_with_opts<'life0, 'life1, 'async_trait>( &'life0 self, offset: u64, buffer: MutableBufferRef<'life1>, _read_opts: ReadOptions, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

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

Fills |buffer| with blocks read from |offset|.

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

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

Closes the block device. It is an error to continue using the device after this, but close itself is idempotent.

fn is_read_only(&self) -> bool

Returns whether the device is read-only.

fn supports_trim(&self) -> bool

Returns whether the device supports trim.

fn write_with_opts<'life0, 'life1, 'async_trait>( &'life0 self, _offset: u64, _buffer: BufferRef<'life1>, _write_opts: WriteOptions, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

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

Writes the contents of |buffer| to the device at |offset|.

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

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

Flush the device.

fn trim<'life0, 'async_trait>( &'life0 self, _range: Range<u64>, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

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

Trims the given device |range|.

fn barrier(&self)

Attach a barrier to the next write made to the device.

fn size(&self) -> u64

Returns the size in bytes of the device.

fn read<'life0, 'life1, 'async_trait>( &'life0 self, offset: u64, buffer: MutableBufferRef<'life1>, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

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

Fills |buffer| with blocks read from |offset|.

fn write<'life0, 'life1, 'async_trait>( &'life0 self, offset: u64, buffer: BufferRef<'life1>, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'async_trait>>

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

Writes the contents of |buffer| to the device at |offset|.

fn reopen(&self, _read_only: bool)

Reopens the device, making it usable again. (Only implemented for testing devices.)

fn snapshot(&self) -> Result<DeviceHolder, Error>

Returns a snapshot of the device.

fn discard_random_since_last_flush(&self) -> Result<(), Error>

Discards random blocks since the last flush.

fn poison(&self) -> Result<(), Error>

Poisons a device to panic on drop. Used to find hanging references.