Struct ReadOnlyDevice 

pub struct ReadOnlyDevice<T> { /* private fields */ }

Wraps any T: BlockRead and makes it read-only at the type level.

Implementations

impl<T> ReadOnlyDevice<T>

pub fn new(inner: T) -> Self

pub fn inner(&self) -> &T

Borrow the wrapped device.

pub fn into_inner(self) -> T

Consume the wrapper and return the inner device unchanged.

Trait Implementations

impl<T: BlockRead> BlockDevice for ReadOnlyDevice<T>

BlockDevice impl uses the trait’s default (Err(ReadOnly) for write_at, no-op flush, is_writable() -> false). Even if T implements BlockDevice with full writes, the wrapper hides that.

fn write_at(&self, _offset: u64, _buf: &[u8]) -> Result<()>

Write exactly buf.len() bytes at offset. Default: returns Error::ReadOnly.

fn flush(&self) -> Result<()>

Flush pending writes to stable storage. No-op by default.

fn is_writable(&self) -> bool

Whether write_at is likely to succeed. Mount paths use this to decide whether to attempt journal replay or stay strict-read-only.

impl<T: BlockRead> BlockRead for ReadOnlyDevice<T>

fn read_at(&self, offset: u64, buf: &mut [u8]) -> Result<()>

Read exactly buf.len() bytes starting at offset (bytes from the start of the device).

fn size_bytes(&self) -> u64

Total device size in bytes. Used for bounds checks.