tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/bio.h>
2#include <linux/io.h>
3#include <linux/export.h>
4#include <xen/page.h>
5
6bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
7 const struct bio_vec *vec2)
8{
9#if XEN_PAGE_SIZE == PAGE_SIZE
10 unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
11 unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page));
12
13 return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
14 ((bfn1 == bfn2) || ((bfn1+1) == bfn2));
15#else
16 /*
17 * XXX: Add support for merging bio_vec when using different page
18 * size in Xen and Linux.
19 */
20 return 0;
21#endif
22}
23EXPORT_SYMBOL(xen_biovec_phys_mergeable);