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block_util: Preserve ordering of sync file backend completions

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For the synchronous backends efficiently preserve the order for
completion requests through the use of VecDequeue. Preserving the order
is not required but is beneficial as it matches the existing
optimisation that looks to match completions and requests.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford
2023-01-10 14:39:28 +00:00
parent ce51755109
commit db5582f7d1
4 changed files with 22 additions and 18 deletions
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7
block_util/src/vhdx_sync.rs
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@@ -4,6 +4,7 @@
use crate::async_io::{AsyncIo, AsyncIoResult, DiskFile, DiskFileError, DiskFileResult};
use crate::AsyncAdaptor;
use std::collections::VecDeque;
use std::fs::File;
use std::sync::{Arc, Mutex, MutexGuard};
use vhdx::vhdx::{Result as VhdxResult, Vhdx};
@@ -37,7 +38,7 @@ impl DiskFile for VhdxDiskSync {
pub struct VhdxSync {
vhdx_file: Arc<Mutex<Vhdx>>,
eventfd: EventFd,
completion_list: Vec<(u64, i32)>,
completion_list: VecDeque<(u64, i32)>,
}
impl VhdxSync {
@@ -45,7 +46,7 @@ impl VhdxSync {
Ok(VhdxSync {
vhdx_file,
eventfd: EventFd::new(libc::EFD_NONBLOCK)?,
completion_list: Vec::new(),
completion_list: VecDeque::new(),
})
}
}
@@ -97,6 +98,6 @@ impl AsyncIo for VhdxSync {
}
fn next_completed_request(&mut self) -> Option<(u64, i32)> {
self.completion_list.pop()
self.completion_list.pop_front()
}
}