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- #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);
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