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UBUNTU: Ubuntu-4.10.0-37.41
[mirror_ubuntu-zesty-kernel.git] / drivers / xen / biomerge.c
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1#include <linux/bio.h>
2#include <linux/io.h>
9ef9b20b 3#include <linux/export.h>
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4#include <xen/page.h>
5
6bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
7 const struct bio_vec *vec2)
8{
36f8abd3 9#if XEN_PAGE_SIZE == PAGE_SIZE
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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));
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12
13 return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
32e09870 14 ((bfn1 == bfn2) || ((bfn1+1) == bfn2));
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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
d8e04206 22}
0b934ccd 23EXPORT_SYMBOL(xen_biovec_phys_mergeable);