drivers/xen/biomerge.c

   1 #include <linux/bio.h>
   2 #include <linux/io.h>
   3 #include <xen/page.h>
   4
   5 bool 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 }