Structs in bsd/ufs/ffs

• cg bsd/ufs/ffs/fs.h:329
• csum bsd/ufs/ffs/fs.h:170
• fs bsd/ufs/ffs/fs.h:180
• ocg bsd/ufs/ffs/fs.h:386
• ufslabel bsd/ufs/ffs/fs.h:547