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

 1#include <linux/bio.h>
 2#include <linux/io.h>
 3#include <linux/export.h>
 4#include <xen/page.h>
 5
 6bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
 7			       const struct bio_vec *vec2)
 8{
 9#if XEN_PAGE_SIZE == PAGE_SIZE
10	unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
11	unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page));
12
13	return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
14		((bfn1 == bfn2) || ((bfn1+1) == bfn2));
15#else
16	/*
17	 * XXX: Add support for merging bio_vec when using different page
18	 * size in Xen and Linux.
19	 */
20	return 0;
21#endif
22}
23EXPORT_SYMBOL(xen_biovec_phys_mergeable);