block: Implement Geometry trait for RawFileDisk

Add disk_file::Geometry trait implementation for RawFileDisk.
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_async.rs

@@ -96,6 +96,15 @@ impl disk_file::DiskFd for RawFileDisk {
     }
 }
 
+impl disk_file::Geometry for RawFileDisk {
+    fn topology(&self) -> DiskTopology {
+        DiskTopology::probe(&self.file).unwrap_or_else(|_| {
+            warn!("Unable to get device topology. Using default topology");
+            DiskTopology::default()
+        })
+    }
+}
+
 pub struct RawFileAsync {
     fd: RawFd,
     io_uring: IoUring,