Struct OverlayDirectoryObject 

pub struct OverlayDirectoryObject {
    overlay_fs: Arc<OverlayFS>,
    path: String,
    position: RwLock<u64>,
}

File object for OverlayFS directory operations

OverlayDirectoryObject handles reading directory entries from overlayfs, merging entries from upper and lower layers while respecting whiteout files.

Fields

overlay_fs: Arc<OverlayFS>

path: String

position: RwLock<u64>

Implementations

impl OverlayDirectoryObject

pub fn new(overlay_fs: Arc<OverlayFS>, path: String) -> Self

fn collect_directory_entries( &self, ) -> Result<Vec<DirectoryEntryInternal>, FileSystemError>

Collect all directory entries from all layers, handling whiteouts and merging

fn try_fs_from_mount( mount: &Arc<MountPoint>, ) -> Result<Arc<dyn FileSystemOperations>, FileSystemError>

Safe version of fs_from_mount that returns Result instead of panicking

Trait Implementations

impl ControlOps for OverlayDirectoryObject

fn control(&self, _command: u32, _arg: usize) -> Result<i32, &'static str>

Perform a control operation

fn supported_control_commands(&self) -> Vec<(u32, &'static str)>

Get a list of supported control commands

impl FileObject for OverlayDirectoryObject

fn seek(&self, _whence: SeekFrom) -> Result<u64, StreamError>

Seek to a position in the file stream

fn metadata(&self) -> Result<FileMetadata, StreamError>

Get metadata about the file

fn truncate(&self, _size: u64) -> Result<(), StreamError>

Truncate the file to the specified size

fn as_any(&self) -> &dyn Any

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

Read data from a specific offset without changing internal position

fn write_at(&self, offset: u64, buffer: &[u8]) -> Result<usize, StreamError>

Write data to a specific offset without changing internal position

fn sync(&self) -> Result<(), StreamError>

Synchronize file content to storage

impl MemoryMappingOps for OverlayDirectoryObject

fn get_mapping_info( &self, _offset: usize, _length: usize, ) -> Result<(usize, usize, bool), &'static str>

Get mapping information for a region of the object

fn on_mapped( &self, _vaddr: usize, _paddr: usize, _length: usize, _offset: usize, )

Notification that a mapping has been created

fn on_unmapped(&self, _vaddr: usize, _length: usize)

Notification that a mapping has been removed

fn supports_mmap(&self) -> bool

Check if memory mapping is supported

fn get_mapping_info_with( &self, offset: usize, length: usize, _is_shared: bool, ) -> Result<(usize, usize, bool), &'static str>

Get mapping information with sharing intent.

fn mmap_owner_name(&self) -> String

Diagnostic helper: return a short owner name for logging

fn resolve_fault( &self, access: &AccessKind, map: &VirtualMemoryMap, ) -> Result<ResolveFaultResult, ResolveFaultError>

impl Selectable for OverlayDirectoryObject

fn wait_until_ready( &self, _interest: ReadyInterest, _trapframe: &mut Trapframe, _timeout_ticks: Option<u64>, ) -> SelectWaitOutcome

Block the current task using the provided trapframe until the interest becomes ready or the optional timeout (in ticks) expires.

fn current_ready(&self, interest: ReadyInterest) -> ReadySet

Return current readiness for the given interest set.

fn set_nonblocking(&self, _enabled: bool)

Enable or disable non-blocking I/O semantics on this object.

fn is_nonblocking(&self) -> bool

Query whether non-blocking I/O semantics are enabled on this object.

impl StreamOps for OverlayDirectoryObject

fn read(&self, buffer: &mut [u8]) -> Result<usize, StreamError>

Read data from the stream

fn write(&self, _buffer: &[u8]) -> Result<usize, StreamError>

Write data to the stream