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virtio-devices: pmem: Derive thiserror::Error

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Signed-off-by: Bo Chen <chen.bo@intel.com>
This commit is contained in:
Bo Chen 2022-09-12 14:47:00 -07:00 committed by Bo Chen
parent 561af4fd1a
commit 9d3ecefc00
1 changed files with 8 additions and 23 deletions
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31
virtio-devices/src/pmem.rs
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@ -18,7 +18,6 @@ use crate::{GuestMemoryMmap, MmapRegion};
use crate::{VirtioInterrupt, VirtioInterruptType};
use anyhow::anyhow;
use seccompiler::SeccompAction;
use std::fmt::{self, Display};
use std::fs::File;
use std::io;
use std::mem::size_of;
@ -26,6 +25,7 @@ use std::os::unix::io::AsRawFd;
use std::result;
use std::sync::atomic::AtomicBool;
use std::sync::{Arc, Barrier};
use thiserror::Error;
use versionize::{VersionMap, Versionize, VersionizeResult};
use versionize_derive::Versionize;
use virtio_queue::{DescriptorChain, Queue, QueueT};
@ -76,37 +76,22 @@ struct VirtioPmemResp {
// SAFETY: it only has data and has no implicit padding.
unsafe impl ByteValued for VirtioPmemResp {}
#[derive(Debug)]
#[derive(Error, Debug)]
enum Error {
/// Guest gave us bad memory addresses.
#[error("Bad guest memory addresses: {0}")]
GuestMemory(GuestMemoryError),
/// Guest gave us a write only descriptor that protocol says to read from.
#[error("Unexpected write-only descriptor")]
UnexpectedWriteOnlyDescriptor,
/// Guest gave us a read only descriptor that protocol says to write to.
#[error("Unexpected read-only descriptor")]
UnexpectedReadOnlyDescriptor,
/// Guest gave us too few descriptors in a descriptor chain.
#[error("Descriptor chain too short")]
DescriptorChainTooShort,
/// Guest gave us a buffer that was too short to use.
#[error("Buffer length too small")]
BufferLengthTooSmall,
/// Guest sent us invalid request.
#[error("Invalid request")]
InvalidRequest,
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::Error::*;
match self {
BufferLengthTooSmall => write!(f, "buffer length too small"),
DescriptorChainTooShort => write!(f, "descriptor chain too short"),
GuestMemory(e) => write!(f, "bad guest memory address: {}", e),
InvalidRequest => write!(f, "invalid request"),
UnexpectedReadOnlyDescriptor => write!(f, "unexpected read-only descriptor"),
UnexpectedWriteOnlyDescriptor => write!(f, "unexpected write-only descriptor"),
}
}
}
#[derive(Debug, PartialEq, Eq)]
enum RequestType {
Flush,