| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 1 | #include <linux/bio.h> |
| 2 | #include <linux/io.h> |
| Stephen Rothwell | 9ef9b20 | 2012-01-19 10:24:31 +1100 | [diff] [blame] | 3 | #include <linux/export.h> |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 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 | } |
| Matthew Wilcox | 0b934cc | 2011-11-04 15:41:27 -0400 | [diff] [blame] | 15 | EXPORT_SYMBOL(xen_biovec_phys_mergeable); |