start_renaming_two_dentries
error = start_renaming_two_dentries(&rd, dentry, target);
rc = start_renaming_two_dentries(&rd, lower_old_dentry, lower_new_dentry);
EXPORT_SYMBOL(start_renaming_two_dentries);
err = start_renaming_two_dentries(&rd, whiteout, dentry);
err = start_renaming_two_dentries(&rd, opaquedir, upper);
err = start_renaming_two_dentries(&rd, newdentry, upper);
int start_renaming_two_dentries(struct renamedata *rd,
ret = start_renaming_two_dentries(&rd, tmp_bool_dir, fsi->bool_dir);
ret = start_renaming_two_dentries(&rd, tmp_class_dir, fsi->class_dir);