[deliverable/linux.git] / drivers / xen / biomerge.c

#include <linux/bio.h>
#include <linux/io.h>
#include <xen/page.h>

bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
			       const struct bio_vec *vec2)
{
	unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page));
	unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page));

	return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
		((mfn1 == mfn2) || ((mfn1+1) == mfn2));
}
Commit	Line	Data
d8e04206 JF	1	#include <linux/bio.h>
	2	#include <linux/io.h>
	3	#include <xen/page.h>
	4
	5	bool 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	}