cloud-hypervisor/block/src/qcow_sync.rs

105 lines
2.7 KiB
Rust
Raw Normal View History

// Copyright © 2021 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
use crate::async_io::{AsyncIo, AsyncIoResult, DiskFile, DiskFileError, DiskFileResult};
use crate::qcow::{QcowFile, RawFile, Result as QcowResult};
use crate::AsyncAdaptor;
use std::collections::VecDeque;
use std::fs::File;
use std::io::{Seek, SeekFrom};
use std::sync::{Arc, Mutex, MutexGuard};
use vmm_sys_util::eventfd::EventFd;
pub struct QcowDiskSync {
qcow_file: Arc<Mutex<QcowFile>>,
}
impl QcowDiskSync {
pub fn new(file: File, direct_io: bool) -> QcowResult<Self> {
Ok(QcowDiskSync {
qcow_file: Arc::new(Mutex::new(QcowFile::from(RawFile::new(file, direct_io))?)),
})
}
}
impl DiskFile for QcowDiskSync {
fn size(&mut self) -> DiskFileResult<u64> {
let mut file = self.qcow_file.lock().unwrap();
file.seek(SeekFrom::End(0)).map_err(DiskFileError::Size)
}
fn new_async_io(&self, _ring_depth: u32) -> DiskFileResult<Box<dyn AsyncIo>> {
Ok(Box::new(QcowSync::new(self.qcow_file.clone())) as Box<dyn AsyncIo>)
}
}
pub struct QcowSync {
qcow_file: Arc<Mutex<QcowFile>>,
eventfd: EventFd,
completion_list: VecDeque<(u64, i32)>,
}
impl QcowSync {
pub fn new(qcow_file: Arc<Mutex<QcowFile>>) -> Self {
QcowSync {
qcow_file,
eventfd: EventFd::new(libc::EFD_NONBLOCK)
.expect("Failed creating EventFd for QcowSync"),
completion_list: VecDeque::new(),
}
}
}
impl AsyncAdaptor<QcowFile> for Arc<Mutex<QcowFile>> {
fn file(&mut self) -> MutexGuard<QcowFile> {
self.lock().unwrap()
}
}
impl AsyncIo for QcowSync {
fn notifier(&self) -> &EventFd {
&self.eventfd
}
fn read_vectored(
&mut self,
offset: libc::off_t,
iovecs: &[libc::iovec],
user_data: u64,
) -> AsyncIoResult<()> {
self.qcow_file.read_vectored_sync(
offset,
iovecs,
user_data,
&self.eventfd,
&mut self.completion_list,
)
}
fn write_vectored(
&mut self,
offset: libc::off_t,
iovecs: &[libc::iovec],
user_data: u64,
) -> AsyncIoResult<()> {
self.qcow_file.write_vectored_sync(
offset,
iovecs,
user_data,
&self.eventfd,
&mut self.completion_list,
)
}
fn fsync(&mut self, user_data: Option<u64>) -> AsyncIoResult<()> {
self.qcow_file
.fsync_sync(user_data, &self.eventfd, &mut self.completion_list)
}
fn next_completed_request(&mut self) -> Option<(u64, i32)> {
self.completion_list.pop_front()
}
}