1 | // SPDX-License-Identifier: GPL-2.0 |
---|---|
2 | #include <linux/bio.h> |
3 | #include <linux/export.h> |
4 | #include <xen/xen.h> |
5 | #include <xen/page.h> |
6 | |
7 | /* check if @page can be merged with 'vec1' */ |
8 | bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, |
9 | const struct page *page) |
10 | { |
11 | #if XEN_PAGE_SIZE == PAGE_SIZE |
12 | unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page)); |
13 | unsigned long bfn2 = pfn_to_bfn(page_to_pfn(page)); |
14 | |
15 | return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2; |
16 | #else |
17 | /* |
18 | * XXX: Add support for merging bio_vec when using different page |
19 | * size in Xen and Linux. |
20 | */ |
21 | return false; |
22 | #endif |
23 | } |
24 |