block: Implement PhysicalSize trait for RawFileDiskSync

Add disk_file::PhysicalSize trait implementation for
RawFileDiskSync. Returns metadata().len() wrapped in
BlockError on failure, consistent with the DiskSize impl.

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

block/src/raw_sync.rs

@@ -73,6 +73,14 @@ impl disk_file::DiskSize for RawFileDiskSync {
     }
 }
 
+impl disk_file::PhysicalSize for RawFileDiskSync {
+    fn physical_size(&self) -> BlockResult<u64> {
+        query_device_size(&self.file)
+            .map(|(_, physical_size)| physical_size)
+            .map_err(|e| BlockError::new(BlockErrorKind::Io, DiskFileError::Size(e)))
+    }
+}
+
 pub struct RawFileSync {
     fd: RawFd,
     eventfd: EventFd,