+off_t exfat_get_root_entry_offset(struct exfat_blk_dev *bd);
+int exfat_show_volume_label(struct exfat_blk_dev *bd, off_t root_clu_off);
+int exfat_set_volume_label(struct exfat_blk_dev *bd,
+ char *label_input, off_t root_clu_off);
+int exfat_read_sector(struct exfat_blk_dev *bd, void *buf,
+ unsigned int sec_off);
+int exfat_write_sector(struct exfat_blk_dev *bd, void *buf,
+ unsigned int sec_off);
+int exfat_write_checksum_sector(struct exfat_blk_dev *bd,
+ unsigned int checksum, bool is_backup);
+char *exfat_conv_volume_serial(struct exfat_dentry *vol_entry);
+int exfat_show_volume_serial(struct exfat_blk_dev *bd,
+ struct exfat_user_input *ui);
+int exfat_set_volume_serial(struct exfat_blk_dev *bd,
+ struct exfat_user_input *ui);
+unsigned int exfat_clus_to_blk_dev_off(struct exfat_blk_dev *bd,
+ unsigned int clu_off, unsigned int clu);
+