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814e8edc0c
The trait has no implementations. All format backends now implement the composable disk_file traits instead. The DiskFileError and AsyncIo types remain in async_io.rs as they are still used by format workers. Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
113 lines
3.4 KiB
Rust
113 lines
3.4 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::marker::PhantomData;
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use std::os::fd::{AsRawFd, OwnedFd, RawFd};
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use thiserror::Error;
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use vmm_sys_util::eventfd::EventFd;
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use crate::{BatchRequest, SECTOR_SIZE};
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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")]
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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")]
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NewAsyncIo(#[source] std::io::Error),
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/// Unsupported operation.
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#[error("Unsupported operation")]
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Unsupported,
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/// Resize failed
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#[error("Resize failed")]
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ResizeError(#[source] std::io::Error),
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#[error("Failed cloning disk file")]
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Clone(#[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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/// A wrapper for [`RawFd`] capturing the lifetime of a corresponding disk file.
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///
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/// This fulfills the same role as [`BorrowedFd`] but is tailored to the limitations
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/// by some disk implementations, which wrap the effective [`File`]
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/// in an `Arc<Mutex<T>>`, making the use of [`BorrowedFd`] impossible.
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///
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/// [`BorrowedFd`]: std::os::fd::BorrowedFd
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#[derive(Copy, Clone, Debug)]
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pub struct BorrowedDiskFd<'fd> {
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raw_fd: RawFd,
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_lifetime: PhantomData<&'fd OwnedFd>,
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}
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impl BorrowedDiskFd<'_> {
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pub(super) fn new(raw_fd: RawFd) -> Self {
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Self {
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raw_fd,
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_lifetime: PhantomData,
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}
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}
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}
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impl AsRawFd for BorrowedDiskFd<'_> {
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fn as_raw_fd(&self) -> RawFd {
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self.raw_fd
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}
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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")]
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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")]
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WriteVectored(#[source] std::io::Error),
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/// Failed synchronizing file.
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#[error("Failed synchronizing file")]
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Fsync(#[source] std::io::Error),
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/// Failed punching hole.
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#[error("Failed punching hole")]
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PunchHole(#[source] std::io::Error),
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/// Failed writing zeroes.
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#[error("Failed writing zeroes")]
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WriteZeroes(#[source] std::io::Error),
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/// Failed submitting batch requests.
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#[error("Failed submitting batch requests")]
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SubmitBatchRequests(#[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 punch_hole(&mut self, offset: u64, length: u64, user_data: u64) -> AsyncIoResult<()>;
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fn write_zeroes(&mut self, offset: u64, length: u64, user_data: u64) -> AsyncIoResult<()>;
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fn next_completed_request(&mut self) -> Option<(u64, i32)>;
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fn batch_requests_enabled(&self) -> bool {
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false
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}
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fn submit_batch_requests(&mut self, _batch_request: &[BatchRequest]) -> AsyncIoResult<()> {
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Ok(())
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}
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fn alignment(&self) -> u64 {
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SECTOR_SIZE
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}
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}
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