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a647d7863c
This is a prerequisite for the next steps. Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de> On-behalf-of: SAP philipp.schuster@sap.com
70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
// Copyright © 2021 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
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use std::os::fd::RawFd;
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use thiserror::Error;
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use vmm_sys_util::eventfd::EventFd;
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use crate::DiskTopology;
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#[derive(Error, Debug)]
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pub enum DiskFileError {
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/// Failed getting disk file size.
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#[error("Failed getting disk file size: {0}")]
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Size(#[source] std::io::Error),
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/// Failed creating a new AsyncIo.
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#[error("Failed creating a new AsyncIo: {0}")]
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NewAsyncIo(#[source] std::io::Error),
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}
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pub type DiskFileResult<T> = std::result::Result<T, DiskFileError>;
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pub trait DiskFile: Send {
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fn size(&mut self) -> DiskFileResult<u64>;
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fn new_async_io(&self, ring_depth: u32) -> DiskFileResult<Box<dyn AsyncIo>>;
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fn topology(&mut self) -> DiskTopology {
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DiskTopology::default()
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}
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/// Returns the file descriptor of the underlying disk image file.
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// Impl Note:
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// This must be `RawFd` instead of `BorrowedFd` or `&File`, as some
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// implementations wrap the file in an `Arc<Mutex<T>>`, which makes it
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// impossible to return a reference.
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fn fd(&mut self) -> RawFd;
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}
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#[derive(Error, Debug)]
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pub enum AsyncIoError {
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/// Failed vectored reading from file.
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#[error("Failed vectored reading from file: {0}")]
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ReadVectored(#[source] std::io::Error),
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/// Failed vectored writing to file.
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#[error("Failed vectored writing to file: {0}")]
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WriteVectored(#[source] std::io::Error),
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/// Failed synchronizing file.
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#[error("Failed synchronizing file: {0}")]
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Fsync(#[source] std::io::Error),
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}
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pub type AsyncIoResult<T> = std::result::Result<T, AsyncIoError>;
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pub trait AsyncIo: Send {
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fn notifier(&self) -> &EventFd;
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fn read_vectored(
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&mut self,
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offset: libc::off_t,
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iovecs: &[libc::iovec],
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user_data: u64,
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) -> AsyncIoResult<()>;
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fn write_vectored(
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&mut self,
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offset: libc::off_t,
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iovecs: &[libc::iovec],
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user_data: u64,
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) -> AsyncIoResult<()>;
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fn fsync(&mut self, user_data: Option<u64>) -> AsyncIoResult<()>;
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fn next_completed_request(&mut self) -> Option<(u64, i32)>;
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}
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