Struct KernelScheme 

pub struct KernelScheme {
    files: SpinLock<BTreeMap<String, (u64, *const u8, usize)>>,
    by_id: SpinLock<BTreeMap<u64, String>>,
}

Kernel-backed scheme: serves files from kernel memory (read-only).

SAFETY: All stored pointers are kernel-static ('static) and accessed only through the scheme trait methods which are &self (shared reference).

Fields

files: SpinLock<BTreeMap<String, (u64, *const u8, usize)>>

Files indexed by path → (id, base, len).

by_id: SpinLock<BTreeMap<u64, String>>

Reverse lookup: file_id → path name.

Implementations

impl KernelScheme

pub fn new() -> Self

Creates a new instance.

pub fn register(&self, path: &str, base: *const u8, len: usize)

Register a static kernel file.

fn get_by_id(&self, file_id: u64) -> Option<(u64, *const u8, usize)>

Returns (id, base, len) for a given file_id.

pub fn lookup_bytes(&self, path: &str) -> Option<&'static [u8]>

Returns the bytes of a registered static kernel file.

Trait Implementations

impl Scheme for KernelScheme

fn open( &self, path: &str, _flags: OpenFlags, ) -> Result<OpenResult, SyscallError>

Performs the open operation.

fn read( &self, file_id: u64, offset: u64, buf: &mut [u8], ) -> Result<usize, SyscallError>

Performs the read operation.

fn write( &self, _file_id: u64, _offset: u64, _buf: &[u8], ) -> Result<usize, SyscallError>

Performs the write operation.

fn close(&self, _file_id: u64) -> Result<(), SyscallError>

Performs the close operation.

fn size(&self, file_id: u64) -> Result<u64, SyscallError>

Performs the size operation.

fn stat(&self, file_id: u64) -> Result<FileStat, SyscallError>

Performs the stat operation.

fn readdir(&self, file_id: u64) -> Result<Vec<DirEntry>, SyscallError>

Performs the readdir operation.

fn async_read( &self, file_id: u64, offset: u64, user_buf_vaddr: u64, len: usize, _ring_id: u64, _user_data: u64, ) -> Result<AsyncSubmitResult, SyscallError>

Submit a read against a userspace buffer for async I/O.

fn async_write( &self, file_id: u64, offset: u64, user_buf_vaddr: u64, len: usize, _ring_id: u64, _user_data: u64, ) -> Result<AsyncSubmitResult, SyscallError>

Submit a write sourced from a userspace buffer for async I/O.

fn truncate(&self, file_id: u64, new_size: u64) -> Result<(), SyscallError>

Truncate/resize a file (if supported).

fn truncate_by_path( &self, _path: &str, _new_size: u64, ) -> Result<(), SyscallError>

Truncate a file by path (avoids open/close round-trip).

fn sync(&self, file_id: u64) -> Result<(), SyscallError>

Sync file to storage (if applicable).

fn create_file(&self, path: &str, mode: u32) -> Result<OpenResult, SyscallError>

Create a new regular file.

fn create_directory( &self, path: &str, mode: u32, ) -> Result<OpenResult, SyscallError>

Create a new directory.

fn unlink(&self, path: &str) -> Result<(), SyscallError>

Remove a file or directory.

fn rename(&self, old_path: &str, new_path: &str) -> Result<(), SyscallError>

Rename/move an entry within this scheme.

fn chmod(&self, path: &str, mode: u32) -> Result<(), SyscallError>

Change permission bits on a path.

fn fchmod(&self, file_id: u64, mode: u32) -> Result<(), SyscallError>

Change permission bits on an open file handle.

fn link(&self, old_path: &str, new_path: &str) -> Result<(), SyscallError>

Create a hard link.

fn symlink(&self, target: &str, link_path: &str) -> Result<(), SyscallError>

Create a symbolic link.

fn readlink(&self, path: &str) -> Result<String, SyscallError>

Read the target of a symbolic link.

impl Send for KernelScheme

impl Sync for KernelScheme