relay: nopage

}

/*

 * nopage() vm_op implementation for relay file mapping.

 * fault() vm_op implementation for relay file mapping.

 */

static struct page *relay_buf_nopage(struct vm_area_struct *vma,

				     unsigned long address,

				     int *type)

static int relay_buf_fault(struct vm_area_struct *vma, struct vm_fault *vmf)

{

	struct page *page;

	struct rchan_buf *buf = vma->vm_private_data;

	unsigned long offset = address - vma->vm_start;

	pgoff_t pgoff = vmf->pgoff;

	if (address > vma->vm_end)

		return NOPAGE_SIGBUS; /* Disallow mremap */

	if (!buf)

		return NOPAGE_OOM;

		return VM_FAULT_OOM;

	page = vmalloc_to_page(buf->start + offset);

	page = vmalloc_to_page(buf->start + (pgoff << PAGE_SHIFT));

	if (!page)

		return NOPAGE_OOM;

		return VM_FAULT_SIGBUS;

	get_page(page);

	vmf->page = page;

	if (type)

		*type = VM_FAULT_MINOR;

	return page;

	return 0;

}

/*

 * vm_ops for relay file mappings.

 */

static struct vm_operations_struct relay_file_mmap_ops = {

	.nopage = relay_buf_nopage,

	.fault = relay_buf_fault,

	.close = relay_file_mmap_close,

};