int exfat_write_checksum_sector(struct exfat_blk_dev *bd,
unsigned int checksum, bool is_backup);
char *exfat_conv_volume_label(struct exfat_dentry *vol_entry);
int exfat_write_checksum_sector(struct exfat_blk_dev *bd,
unsigned int checksum, bool is_backup);
char *exfat_conv_volume_label(struct exfat_dentry *vol_entry);