| #include <linux/bio.h> |
| #include <linux/io.h> |
| #include <linux/export.h> |
| #include <xen/page.h> |
| |
| bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, |
| const struct bio_vec *vec2) |
| { |
| #if XEN_PAGE_SIZE == PAGE_SIZE |
| unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page)); |
| unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page)); |
| |
| return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2; |
| #else |
| /* |
| * XXX: Add support for merging bio_vec when using different page |
| * size in Xen and Linux. |
| */ |
| return 0; |
| #endif |
| } |
| EXPORT_SYMBOL(xen_biovec_phys_mergeable); |
