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//! An asynchronous and high-level implementation of the Filesystem in Userspace protocol.
//!
//! `blown-fuse`
#![forbid(unsafe_code)]
#![feature(try_trait_v2)]
#[cfg(not(target_os = "linux"))]
compile_error!("Unsupported OS");
use std::{
marker::PhantomData,
time::{SystemTime, UNIX_EPOCH},
};
pub use nix;
pub use nix::errno::Errno;
pub use util::{FuseError, FuseResult};
pub mod io;
pub mod mount;
pub mod ops;
pub mod session;
mod proto;
mod util;
pub trait Operation<'o>: private_trait::Sealed + Sized {
type RequestBody: crate::proto::Structured<'o>;
type ReplyTail;
}
pub type Op<'o, O = ops::Any> = (Request<'o, O>, Reply<'o, O>);
pub struct Request<'o, O: Operation<'o>> {
header: proto::InHeader,
body: O::RequestBody,
}
#[must_use]
pub struct Reply<'o, O: Operation<'o>> {
session: &'o session::Session,
unique: u64,
tail: O::ReplyTail,
}
/// Inode number.
///
/// This is a public newtype. Users are expected to inspect the underlying `u64` and construct
/// arbitrary `Ino` objects.
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
pub struct Ino(pub u64);
#[must_use]
pub struct Done<'o>(PhantomData<&'o mut &'o ()>);
#[derive(Copy, Clone, Eq, PartialEq)]
pub struct Ttl {
seconds: u64,
nanoseconds: u32,
}
#[derive(Copy, Clone, Default, Eq, PartialEq)]
pub struct Timestamp {
seconds: i64,
nanoseconds: u32,
}
impl Done<'_> {
fn new() -> Self {
Done(PhantomData)
}
fn consume(self) {
drop(self);
}
}
impl Ino {
/// The invalid inode number, mostly useful for internal aspects of the FUSE protocol.
pub const NULL: Self = Ino(0);
/// The inode number of the root inode as observed by a FUSE client. Other libraries refer to
/// this as `FUSE_ROOT_ID`.
///
/// Note that a mounted session will remember the inode number given by `Inode::ino()` for the
/// root inode at initialization and transparently swap between it and `Ino::ROOT`. During
/// dispatch, requests targeted at `Ino::ROOT` will have this value replaced by the stored root
/// number, while replies involving the root inode will always report `Ino::ROOT` to the FUSE
/// client. Therefore, filesystems do not have to be aware of `Ino::ROOT` in most cases.
pub const ROOT: Self = Ino(proto::ROOT_ID);
/// Extracts the raw inode number.
pub fn as_raw(self) -> u64 {
self.0
}
}
impl std::fmt::Display for Ino {
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(formatter, "{}", self.0)
}
}
impl Ttl {
pub const NULL: Self = Ttl {
seconds: 0,
nanoseconds: 0,
};
pub const MAX: Self = Ttl {
seconds: u64::MAX,
nanoseconds: u32::MAX,
};
pub fn new(seconds: u64, nanoseconds: u32) -> Ttl {
assert!(nanoseconds < 1_000_000_000);
Ttl {
seconds,
nanoseconds,
}
}
pub fn seconds(&self) -> u64 {
self.seconds
}
pub fn nanoseconds(&self) -> u32 {
self.nanoseconds
}
}
impl Timestamp {
pub fn new(seconds: i64, nanoseconds: u32) -> Self {
Timestamp {
seconds,
nanoseconds,
}
}
}
impl From<SystemTime> for Timestamp {
fn from(time: SystemTime) -> Self {
let (seconds, nanoseconds) = match time.duration_since(UNIX_EPOCH) {
Ok(duration) => {
let secs = duration.as_secs().try_into().unwrap();
(secs, duration.subsec_nanos())
}
Err(before_epoch) => {
let duration = before_epoch.duration();
let secs = -i64::try_from(duration.as_secs()).unwrap();
(secs, duration.subsec_nanos())
}
};
Timestamp {
seconds,
nanoseconds,
}
}
}
mod private_trait {
pub trait Sealed {}
}
|
