setbmap
#define setbmap(blkno) setbit(blockmap, blkno)
#define setbmap(blkno) setbit(blockmap, blkno)
#define setbmap(blkno) setbit(blockmap, blkno)
#define setbmap(blkno,ino) if(blkno > maxfsblock)raise(1); else blockmap[blkno] = ino