cifs: fix renaming one hardlink on top of another

cifs: fix renaming one hardlink on top of another

POSIX says that renaming one hardlink on top of another to the same
inode is a no-op. We had the logic mostly right, but forgot to clear
the return code.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/inode.c

@@ -1361,9 +1361,11 @@ int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
 
 		if (tmprc == 0 && (info_buf_source->UniqueId ==
-				   info_buf_target->UniqueId))
+				   info_buf_target->UniqueId)) {
 			/* same file, POSIX says that this is a noop */
+			rc = 0;
 			goto cifs_rename_exit;
+		}
 	} /* else ... BB we could add the same check for Windows by
 		     checking the UniqueId via FILE_INTERNAL_INFO */