drivers/xen/biomerge.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

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

bool xen_page_phys_mergeable(const struct page *p1, const struct page *p2)
{
	unsigned long mfn1 = pfn_to_mfn(page_to_pfn(p1));
	unsigned long mfn2 = pfn_to_mfn(page_to_pfn(p2));

	return mfn1 + 1 == mfn2;
}

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));
}
EXPORT_SYMBOL(xen_biovec_phys_mergeable);