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

#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)
{
	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 __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
		((bfn1 == bfn2) || ((bfn1+1) == bfn2));
}
EXPORT_SYMBOL(xen_biovec_phys_mergeable);
Commit	Line	Data
d8e04206 JF	1	#include <linux/bio.h>
d8e04206 JF	2	#include <linux/io.h>
9ef9b20b	3	#include <linux/export.h>
d8e04206 JF	4	#include <xen/page.h>
	5
	6	bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
	7	const struct bio_vec *vec2)
	8	{
32e09870 JG	9	unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
32e09870 JG	10	unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page));
d8e04206 JF	11
d8e04206 JF	12	return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
32e09870	13	((bfn1 == bfn2) \|\| ((bfn1+1) == bfn2));
d8e04206	14	}
0b934ccd	15	EXPORT_SYMBOL(xen_biovec_phys_mergeable);