mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
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b2e5dbaecb
This commit adds the asynchronous support for fixed VHD disk files. It introduces FixedVhd as a new ImageType, moving the image type detection to the block_util crate (instead of qcow crate). It creates a new vhd module in the block_util crate in order to handle VHD footer, following the VHD specification. It creates a new fixed_vhd_async module in the block_util crate to implement the asynchronous version of fixed VHD disk file. It relies on io_uring. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
111 lines
2.8 KiB
Rust
111 lines
2.8 KiB
Rust
// Copyright © 2021 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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use crate::async_io::{
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AsyncIo, AsyncIoError, AsyncIoResult, DiskFile, DiskFileError, DiskFileResult,
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};
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use crate::raw_async::RawFileAsync;
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use crate::vhd::VhdFooter;
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use std::fs::File;
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use std::os::unix::io::{AsRawFd, RawFd};
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use vmm_sys_util::eventfd::EventFd;
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pub struct FixedVhdDiskAsync {
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file: File,
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size: u64,
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}
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impl FixedVhdDiskAsync {
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pub fn new(mut file: File) -> std::io::Result<Self> {
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let footer = VhdFooter::new(&mut file)?;
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Ok(FixedVhdDiskAsync {
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file,
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size: footer.current_size(),
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})
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}
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}
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impl DiskFile for FixedVhdDiskAsync {
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fn size(&mut self) -> DiskFileResult<u64> {
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Ok(self.size)
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}
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fn new_async_io(&self, ring_depth: u32) -> DiskFileResult<Box<dyn AsyncIo>> {
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Ok(Box::new(
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FixedVhdAsync::new(self.file.as_raw_fd(), ring_depth, self.size)
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.map_err(DiskFileError::NewAsyncIo)?,
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) as Box<dyn AsyncIo>)
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}
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}
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pub struct FixedVhdAsync {
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raw_file_async: RawFileAsync,
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size: u64,
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}
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impl FixedVhdAsync {
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pub fn new(fd: RawFd, ring_depth: u32, size: u64) -> std::io::Result<Self> {
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let raw_file_async = RawFileAsync::new(fd, ring_depth)?;
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Ok(FixedVhdAsync {
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raw_file_async,
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size,
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})
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}
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}
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impl AsyncIo for FixedVhdAsync {
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fn notifier(&self) -> &EventFd {
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self.raw_file_async.notifier()
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}
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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: Vec<libc::iovec>,
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user_data: u64,
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) -> AsyncIoResult<()> {
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if offset as u64 >= self.size {
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return Err(AsyncIoError::ReadVectored(std::io::Error::new(
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std::io::ErrorKind::InvalidData,
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format!(
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"Invalid offset {}, can't be larger than file size {}",
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offset, self.size
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),
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)));
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}
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self.raw_file_async.read_vectored(offset, iovecs, user_data)
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}
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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: Vec<libc::iovec>,
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user_data: u64,
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) -> AsyncIoResult<()> {
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if offset as u64 >= self.size {
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return Err(AsyncIoError::WriteVectored(std::io::Error::new(
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std::io::ErrorKind::InvalidData,
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format!(
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"Invalid offset {}, can't be larger than file size {}",
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offset, self.size
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),
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)));
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}
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self.raw_file_async
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.write_vectored(offset, iovecs, user_data)
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}
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fn fsync(&mut self, user_data: Option<u64>) -> AsyncIoResult<()> {
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self.raw_file_async.fsync(user_data)
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}
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fn complete(&mut self) -> Vec<(u64, i32)> {
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self.raw_file_async.complete()
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}
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}
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