Struct FileHandle 

pub struct FileHandle {
    pub inode: Option<Arc<Inode>>,
    pub read: bool,
    pub write: bool,
    pub offset: Cell<usize>,
}

Cached file metadata in memory

Fields

inode: Option<Arc<Inode>>

FileSystem Inode

read: bool

Open options: able to read

write: bool

Open options: able to write

offset: Cell<usize>

Current offset

Implementations

impl FileHandle

pub fn new(read: bool, write: bool, inode: Arc<Inode>) -> Self

创建一个新的文件句柄。

pub fn empty(read: bool, write: bool) -> Self

创建一个空的文件句柄（无 inode）。

pub fn readable(&self) -> bool

是否可读。

pub fn writable(&self) -> bool

是否可写。

pub fn read(&self, buf: UserBuffer) -> isize

从文件读取数据到用户缓冲区。

pub fn write(&self, buf: UserBuffer) -> isize

将用户缓冲区数据写入文件。

Trait Implementations

impl Clone for FileHandle

fn clone(&self) -> FileHandle

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.