drivers/xen/biomerge.c

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