block: Implement Geometry trait for RawFileDiskSync

Add disk_file::Geometry trait implementation for
RawFileDiskSync. Probes disk topology from the file,
falling back to defaults on failure. Takes &self instead
of &mut self and uses unwrap_or_else for cleaner error
handling.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

block/src/raw_sync.rs

@@ -87,6 +87,15 @@ impl disk_file::DiskFd for RawFileDiskSync {
     }
 }
 
+impl disk_file::Geometry for RawFileDiskSync {
+    fn topology(&self) -> DiskTopology {
+        DiskTopology::probe(&self.file).unwrap_or_else(|_| {
+            warn!("Unable to get device topology. Using default topology");
+            DiskTopology::default()
+        })
+    }
+}
+
 pub struct RawFileSync {
     fd: RawFd,
     eventfd: EventFd,