bread
bread(daddr_t blkno, char *buf, int size)
bread(int fd, char *buf, daddr_t blk, long size)
bread(int fd, char *buf, daddr_t blk, long size)
bread(struct uvnode * vp, daddr_t lbn, int size, int flags, struct ubuf ** bpp)
bread(daddr_t blk, char *buffer, int cnt, const char *file)
bread(struct vnode *vp, daddr_t blkno, int size, int flags, buf_t **bpp)
bread(daddr_t bno, char *buf, long cnt)