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block: qcow: Thread sparse configuration to QCOW2 constructors

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Add sparse parameter to QcowFile constructors and propagate it from
device_manager through QcowDiskSync. This makes the sparse configuration
available throughout the QCOW2 implementation for controlling allocation
and deallocation behavior.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-02-01 23:35:03 +01:00
committed by Rob Bradford
parent 46e6ecddfe
commit 0a287793df
3 changed files with 54 additions and 37 deletions
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24
block/src/qcow_sync.rs
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@@ -13,7 +13,7 @@ use vmm_sys_util::eventfd::EventFd;
use crate::async_io::{
AsyncIo, AsyncIoError, AsyncIoResult, BorrowedDiskFd, DiskFile, DiskFileError, DiskFileResult,
};
use crate::qcow::{QcowFile, RawFile, Result as QcowResult};
use crate::qcow::{MAX_NESTING_DEPTH, QcowFile, RawFile, Result as QcowResult};
use crate::{AsyncAdaptor, BlockBackend};
pub struct QcowDiskSync {
@@ -29,19 +29,15 @@ pub struct QcowDiskSync {
}
impl QcowDiskSync {
pub fn new(file: File, direct_io: bool, backing_files: bool) -> QcowResult<Self> {
if backing_files {
Ok(QcowDiskSync {
qcow_file: Arc::new(Mutex::new(QcowFile::from(RawFile::new(file, direct_io))?)),
})
} else {
Ok(QcowDiskSync {
qcow_file: Arc::new(Mutex::new(QcowFile::from_with_nesting_depth(
RawFile::new(file, direct_io),
0,
)?)),
})
}
pub fn new(file: File, direct_io: bool, backing_files: bool, sparse: bool) -> QcowResult<Self> {
let max_nesting_depth = if backing_files { MAX_NESTING_DEPTH } else { 0 };
Ok(QcowDiskSync {
qcow_file: Arc::new(Mutex::new(QcowFile::from_with_nesting_depth(
RawFile::new(file, direct_io),
max_nesting_depth,
sparse,
)?)),
})
}
}