mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-09-12 10:04:51 +00:00
30033bdaea
Both DiskFile and AsyncIo traits are introduced to allow all kind of files (RAW, QCOW, VHD) to be able to handle asynchronous access to the underlying file. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
57 lines
1.7 KiB
Rust
57 lines
1.7 KiB
Rust
// Copyright © 2021 Intel Corporation
|
|
//
|
|
// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
|
|
|
|
use thiserror::Error;
|
|
use vmm_sys_util::eventfd::EventFd;
|
|
|
|
#[derive(Error, Debug)]
|
|
pub enum DiskFileError {
|
|
/// Failed getting disk file size.
|
|
#[error("Failed getting disk file size: {0}")]
|
|
Size(#[source] std::io::Error),
|
|
/// Failed creating a new AsyncIo.
|
|
#[error("Failed creating a new AsyncIo: {0}")]
|
|
NewAsyncIo(#[source] std::io::Error),
|
|
}
|
|
|
|
pub type DiskFileResult<T> = std::result::Result<T, DiskFileError>;
|
|
|
|
pub trait DiskFile: Send + Sync {
|
|
fn size(&mut self) -> DiskFileResult<u64>;
|
|
fn new_async_io(&self, ring_depth: u32) -> DiskFileResult<Box<dyn AsyncIo>>;
|
|
}
|
|
|
|
#[derive(Error, Debug)]
|
|
pub enum AsyncIoError {
|
|
/// Failed vectored reading from file.
|
|
#[error("Failed vectored reading from file: {0}")]
|
|
ReadVectored(#[source] std::io::Error),
|
|
/// Failed vectored writing to file.
|
|
#[error("Failed vectored writing to file: {0}")]
|
|
WriteVectored(#[source] std::io::Error),
|
|
/// Failed synchronizing file.
|
|
#[error("Failed synchronizing file: {0}")]
|
|
Fsync(#[source] std::io::Error),
|
|
}
|
|
|
|
pub type AsyncIoResult<T> = std::result::Result<T, AsyncIoError>;
|
|
|
|
pub trait AsyncIo: Send + Sync {
|
|
fn notifier(&self) -> &EventFd;
|
|
fn read_vectored(
|
|
&mut self,
|
|
offset: libc::off_t,
|
|
iovecs: Vec<libc::iovec>,
|
|
user_data: u64,
|
|
) -> AsyncIoResult<()>;
|
|
fn write_vectored(
|
|
&mut self,
|
|
offset: libc::off_t,
|
|
iovecs: Vec<libc::iovec>,
|
|
user_data: u64,
|
|
) -> AsyncIoResult<()>;
|
|
fn fsync(&mut self, user_data: Option<u64>) -> AsyncIoResult<()>;
|
|
fn complete(&mut self) -> Vec<(u64, i32)>;
|
|
}
|