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misc: block: streamline #[source] and Error impl

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This streamlines the Error implementation in the Cloud Hypervisor code
base to match the remaining parts so that everything follows the agreed
conventions. These are leftovers missed in the previous commits.

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
On-behalf-of: SAP philipp.schuster@sap.com
This commit is contained in:
Philipp Schuster 2025-05-21 13:02:29 +02:00 • committed by Rob Bradford
parent a6370b74d9
commit dd9bce31e8
1 changed files with 7 additions and 17 deletions
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24
block/src/fcntl.rs
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@ -13,35 +13,25 @@
//!
//! [0]: <https://apenwarr.ca/log/20101213>.
use std::error::Error;
use std::fmt::{Debug, Display, Formatter};
use std::fmt::Debug;
use std::io;
use std::os::fd::{AsRawFd, RawFd};
use thiserror::Error;
/// Errors that can happen when working with file locks.
#[derive(Debug)]
#[derive(Error, Debug)]
pub enum LockError {
/// The file is already locked.
///
/// A call to [`get_lock_state`] can help to identify the reason.
#[error("The file is already locked")]
AlreadyLocked,
/// IO error.
Io(io::Error),
#[error("The lock state could not be checked or set: {0}")]
Io(#[source] io::Error),
}
impl Display for LockError {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
LockError::AlreadyLocked => f.write_str("The file is already locked"),
LockError::Io(e) => {
write!(f, "{e}")
}
}
}
}
impl Error for LockError {}
/// Commands for use with [`fcntl`].
#[allow(non_camel_case_types)]
enum FcntlArg<'a> {