Macros starting with `f' in ufs

• fragnum ufs/fs.h:400
• fragoff ufs/fs.h:384
• fragroundup ufs/fs.h:394
• fragstoblks ufs/fs.h:396
• freespace ufs/fs.h:409
• fsbtodb ufs/fs.h:330
• fs_cs ufs/fs.h:250
• fs_postbl ufs/fs.h:236
• fs_rotbl ufs/fs.h:240