SYNC_IOC_MAGIC     86 include/uapi/linux/sync_file.h #define SYNC_IOC_MERGE		_IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
SYNC_IOC_MAGIC     96 include/uapi/linux/sync_file.h #define SYNC_IOC_FILE_INFO	_IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info)