mirror of https://gitee.com/openkylin/linux.git
24 lines
617 B
C
24 lines
617 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/bio.h>
|
|
#include <linux/export.h>
|
|
#include <xen/xen.h>
|
|
#include <xen/page.h>
|
|
|
|
/* check if @page can be merged with 'vec1' */
|
|
bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
|
|
const struct page *page)
|
|
{
|
|
#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(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 false;
|
|
#endif
|
|
}
|