static void dax_set_mapping()

in device.c [76:101]

• 20 lines of code
• 4 McCabe index (conditional complexity)

static void dax_set_mapping(struct vm_fault *vmf, pfn_t pfn,
			      unsigned long fault_size)
{
	unsigned long i, nr_pages = fault_size / PAGE_SIZE;
	struct file *filp = vmf->vma->vm_file;
	struct dev_dax *dev_dax = filp->private_data;
	pgoff_t pgoff;

	/* mapping is only set on the head */
	if (dev_dax->pgmap->vmemmap_shift)
		nr_pages = 1;

	pgoff = linear_page_index(vmf->vma,
			ALIGN(vmf->address, fault_size));

	for (i = 0; i < nr_pages; i++) {
		struct page *page = pfn_to_page(pfn_t_to_pfn(pfn) + i);

		page = compound_head(page);
		if (page->mapping)
			continue;

		page->mapping = filp->f_mapping;
		page->index = pgoff + i;
	}
}