23 строки
585 B
C
23 строки
585 B
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)
|
|
{
|
|
#if XEN_PAGE_SIZE == PAGE_SIZE
|
|
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 bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2;
|
|
#else
|
|
/*
|
|
* XXX: Add support for merging bio_vec when using different page
|
|
* size in Xen and Linux.
|
|
*/
|
|
return 0;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(xen_biovec_phys_mergeable);
|