set Block(int): partition UsedBlock | FreeBlock
set FreeBlock(int):
set Inode(int): partition UsedInode | FreeInode
set FreeInode(int):
set UsedInode(int): partition FileInode | DirectoryInode 
set FileInode(int):
set DirectoryInode(int): RootDirectoryInode
set RootDirectoryInode(int):
set UsedBlock(int): partition SuperBlock | GroupBlock | FileDirectoryBlock | InodeTableBlock | InodeBitmapBlock | BlockBitmapBlock
set FileDirectoryBlock(int): DirectoryBlock | FileBlock
set SuperBlock(int):
set GroupBlock(int):
set FileBlock(int):
set DirectoryBlock(int):
set InodeTableBlock(int):
set InodeBitmapBlock(int):
set BlockBitmapBlock(int):
set DirectoryEntry(DirectoryEntry):
inodeof: DirectoryEntry -> UsedInode (many->1)
contents: UsedInode -> FileDirectoryBlock (1->many)
inodestatus: Inode -> token (many->1)
blockstatus: Block -> token (many->1)
referencecount: Inode -> int (many->1)
filesize: Inode -> int (many->1)