biomerge.c revision d8e0420603cf1ce9cb459c00ea0b7337de41b968 
1#include <linux/bio.h>
2#include <linux/io.h>
3#include <xen/page.h>
4
5bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
6			       const struct bio_vec *vec2)
7{
8	unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page));
9	unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page));
10
11	return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
12		((mfn1 == mfn2) || ((mfn1+1) == mfn2));
13}
14