block: rename DiskFile::size() -> DiskFile::logical_size()

This better reflects the actual usage.

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
On-behalf-of: SAP philipp.schuster@sap.com

block/src/vhdx_sync.rs

@@ -8,11 +8,11 @@ use std::os::fd::AsRawFd;
 
 use vmm_sys_util::eventfd::EventFd;
 
-use crate::AsyncAdaptor;
 use crate::async_io::{
     AsyncIo, AsyncIoResult, BorrowedDiskFd, DiskFile, DiskFileError, DiskFileResult,
 };
 use crate::vhdx::{Result as VhdxResult, Vhdx};
+use crate::{AsyncAdaptor, BlockBackend, Error};
 
 pub struct VhdxDiskSync {
     vhdx_file: Vhdx,
@@ -27,7 +27,7 @@ impl VhdxDiskSync {
 }
 
 impl DiskFile for VhdxDiskSync {
-    fn size(&mut self) -> DiskFileResult<u64> {
+    fn logical_size(&mut self) -> DiskFileResult<u64> {
         Ok(self.vhdx_file.virtual_disk_size())
     }