Implement breadn()

[OlliV]

zeke/kern/bio.c

Lines 100 to 105 in 9524dad

	int breadn(vnode_t * vnode, size_t blkno, int size, size_t rablks[],
	int rasizes[], int nrablks, struct buf ** bpp)
	{
	/* TODO */
	return -ENOTSUP;
	}