Struct OverlayFs 

pub struct OverlayFs { /* private fields */ }

Overlay filesystem combining multiple layers.

Implementations

impl OverlayFs

pub fn new(work_dir: &str) -> Self

Create a new overlay filesystem.

pub fn add_lower_layer(&mut self, layer: OverlayLayer)

Add a read-only lower layer (bottom-most first).

pub fn lookup(&self, path: &str) -> Option<&OverlayEntry>

Look up a file: check upper layer first, then lower layers top to bottom.

pub fn write_file( &mut self, path: &str, content: Vec<u8>, mode: u32, ) -> Result<(), KernelError>

Write a file to the upper layer. If the file exists in a lower layer, performs copy-up first.

pub fn delete_file(&mut self, path: &str) -> Result<(), KernelError>

Delete a file by creating a whiteout in the upper layer.

pub fn make_opaque_dir(&mut self, dir_path: &str) -> Result<(), KernelError>

Make a directory opaque (hides all entries from lower layers).

pub fn list_dir(&self, dir_path: &str) -> Vec<&OverlayEntry>

List directory contents merging all layers. Upper entries take precedence. Whited-out entries are excluded.

pub fn work_dir(&self) -> &str

pub fn lower_layer_count(&self) -> usize

Trait Implementations

impl Debug for OverlayFs

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.