All symbols starting with `d' in ufs/ffs

• dblksize ufs/ffs/fs.h:477
• dbtofsb ufs/ffs/fs.h:388
• DEFAULTOPT ufs/ffs/fs.h:135
• doasyncfree ufs/ffs/ffs_alloc.c:307
• doclusterread ufs/ffs/ffs_vnops.c:224
• doclusterwrite ufs/ffs/ffs_vnops.c:225
• doreallocblks ufs/ffs/ffs_alloc.c:308
• DOUBLE ufs/ffs/ffs_inode.c:128
• dtog ufs/ffs/fs.h:418
• dtogd ufs/ffs/fs.h:419