cyberus-technology · Coffeeri · Apr 27, 2026 · Apr 27, 2026 · Apr 28, 2026 · Apr 29, 2026
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/block/Cargo.toml b/block/Cargo.toml
@@ -13,6 +13,7 @@ io_uring = ["dep:io-uring"]
 bitflags = { workspace = true }
 byteorder = { workspace = true }
 crc-any = "2.5.0"
+event_monitor = { path = "../event_monitor" }
 flate2 = "1.1"
 io-uring = { version = "0.7.12", optional = true }
 libc = { workspace = true }

diff --git a/block/src/disk_file.rs b/block/src/disk_file.rs
@@ -36,7 +36,7 @@
 use std::fmt::Debug;
 
 use crate::async_io::{AsyncIo, BorrowedDiskFd};
-use crate::{BlockResult, DiskTopology};
+use crate::{BlockError, BlockErrorKind, BlockResult, DiskTopology};
 
 /// Reported capacity of a disk image.
 pub trait DiskSize: Send + Debug {
@@ -96,7 +96,12 @@ pub trait Resizable: Send + Debug {
 /// Every disk format implements `DiskSize` and `Geometry`.
 /// `Sync` is required so that `Arc<dyn DiskFile>` can be shared
 /// across threads for concurrent readonly access.
-pub trait DiskFile: DiskSize + Geometry + Sync {}
+pub trait DiskFile: DiskSize + Geometry + Sync {
+    /// Returns an error if this disk image cannot participate in block mirroring.
+    fn supports_mirroring(&self) -> BlockResult<()> {
+        Err(BlockError::from_kind(BlockErrorKind::UnsupportedFeature))
+    }
+}
 
 /// Full capability disk file trait.
 ///

diff --git a/block/src/lib.rs b/block/src/lib.rs
@@ -20,6 +20,7 @@ pub mod fixed_vhd;
 pub mod fixed_vhd_async;
 pub mod fixed_vhd_disk;
 pub mod fixed_vhd_sync;
+pub mod mirror;
 pub mod qcow;
 #[cfg(feature = "io_uring")]
 pub(crate) mod qcow_async;