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 bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2;
14#else
15 /*
16 * XXX: Add support for merging bio_vec when using different page
17 * size in Xen and Linux.
18 */
19 return 0;
20#endif
21}
22EXPORT_SYMBOL(xen_biovec_phys_mergeable);