225     offset: Option<u64>,  field
1174         let offset: usize = self.cluster_bytes_offset(cluster) as usize;  in zero_cluster()  localVariable
1178             .write_at(offset, zeros.len(), zeros.as_slice())?;  in zero_cluster()
1232         fsinfo.offset = Some(in_disk_fs_info_offset);  in new()
1302         if let Some(off) = self.offset {  in flush()
1331         if let Some(off) = self.offset {  in update()
1357         offset: usize,  in read_at()
1368                     offset as u64,  in read_at()
1385         offset: usize,  in write_at()
1395                 let r = f.write(fs, &buf[0..len], offset as u64);  in write_at()
1485                     let mut offset = old_size;  in resize()  localVariable
1488                         file.write(fs, &buf[0..write_size], offset as u64)?;  in resize()
1490                         offset += write_size;  in resize()
1668             offset: None,  in default()