#define EXFAT_NAME_MAX 256
#define EXFAT_ATTRIB_CONTIGUOUS 0x10000
#define EXFAT_ATTRIB_CACHED 0x20000
+#define EXFAT_ATTRIB_DIRTY 0x40000
#define IS_CONTIGUOUS(node) (((node).flags & EXFAT_ATTRIB_CONTIGUOUS) != 0)
#define BLOCK_SIZE(sb) (1 << (sb).block_bits)
#define CLUSTER_SIZE(sb) (BLOCK_SIZE(sb) << (sb).bpc_bits)