setblock
setblock(&sblock, cg_blksfree(&icg), d/sblock.fs_frag);
setblock(&sblock, cg_blksfree(&icg), bno);
static void setblock(struct fs *fs, unsigned char *cp, int h);
setblock(fs, blksfree, blkno);
extern void setblock(struct fs *, uchar_t *, daddr_t);