Struct virtio_device::fake_queue::UsedChain

pub struct UsedChain { /* private fields */ }

Represents a chain returned by a device.

Implementations

impl UsedChain

pub fn written(&self) -> u32

Get the amount of data written to the chain.

This is the amount of data the device claimed it wrote to the chain and could be incorrect, for example some devices do not zero this field when they return a read only chain.

pub fn data_iter<'a>(&'a self) -> ChainDataIter<'a>

Iterate over any written portions.

Iterates over the writable portion of the descriptor chain, up to the amount that was claimed to be written. The iterator produces (driver_addr as u64, length as u32) tuples and it is the responsibility of the caller to know if this range is valid and how to access it.