biomerge.c

Go to the documentation of this file.

#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 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);